I learned this the hard way. And I mean… properly the hard way.
Because the marathon doesn’t care what you think you can get away with. It just… shows you.
My first training cycle, I was sitting around 25 miles per week. And at the time, that felt fine. Actually felt kind of smart. Like I was being efficient. Like I’d figured out some shortcut nobody talks about.
I told myself I could make up for it with stubbornness. Maybe a couple longer runs. Push a bit harder when it mattered.
And in training… yeah, I felt okay. Not amazing. But okay enough that I started believing my own story.
Then race day showed up.
And somewhere around mile 18… things started to slip. Not all at once. It wasn’t dramatic. It was slower than that.
Like something was draining out of me.
My legs got heavy. Not sore, just… heavy. Like they didn’t belong to me anymore. My stride shortened without me deciding to do it. My head got foggy. And every step felt like it needed a little negotiation.
“Just one more mile.”
“Just get to the next marker.”
And then again.
And again.
By the last few miles… I wasn’t running anymore. Not really. It was more like moving forward and hoping it counted.
Cramps creeping in. Thoughts getting louder. That quiet realization starting to settle in that… yeah, I probably got this wrong.
I kept trying to push. Of course I did. Everyone does.
But the marathon had already made its decision.
I crossed the line completely empty. But not in a proud way.
More like…
“You didn’t respect this.”
And that feeling sticks. Longer than the soreness.
Fast forward to now… things look different. Not overnight. Nothing about this was quick.
I’m coaching now. Running consistently. Living in Bali.
And the heat here… it doesn’t let you fake anything.
You either did the work… or it shows up immediately.
These days, running 20–30 miles across a weekend isn’t unusual. Long run, then a recovery run the next day. And doing that in heat and humidity… it strips away all the stories you try to tell yourself.
Back then, I thought mileage was negotiable. Like you could trade it for toughness. Or mindset. Or grit.
Now it just feels… quieter than that.
Like a foundation.
You don’t see it working. But when it’s missing… everything collapses.
Running in 32°C heat makes that obvious real fast. There’s no middle ground there. You either built something… or you didn’t.
So I stopped treating mileage like something impressive.
Stopped trying to hit numbers just to feel like I was doing enough.
And started thinking of it more like insurance.
Something that protects you… later. When things get uncomfortable. When there’s nowhere left to hide.
And if you’re reading this…
You’re probably asking the same stuff I did.
Is 30 miles per week enough?
Do I really need 50 or 60?
How do you even build that without breaking something… or your schedule… or just burning out?
Yeah. I’ve been there.
And none of it feels simple when you’re in it.
The Marathon Mileage Misconception
One of the biggest misunderstandings… and I see this all the time… is this idea that everything comes down to one big long run.
Like there’s this one session — 20 miles — and once you survive it, you’re good. Done. Ready.
I believed that too.
The logic sounds reasonable when you’re in it:
“If I can run 20… then 26.2 isn’t that much more.”
But that’s not how it works.
The marathon isn’t about one long effort.
It’s about holding things together for three… four… sometimes five hours straight.
That’s a different problem entirely.
If your weekly mileage is sitting around 20–25 miles… trying to grind through a marathon is kind of like cramming the night before an exam.
You might get through it.
But it’s going to hurt in ways you didn’t plan for.
That was my first marathon.
It wasn’t that I lacked toughness. I had plenty of that.
What I didn’t have… was months of consistent mileage sitting underneath everything.
And you feel that absence later. Not at mile 5. Not even at mile 10.
It shows up when it’s too late to fix anything.
And then there’s real life. Which… doesn’t care about your training plan.
You’ve got work. Family. Bad sleep. Random aches. Days where even finding time for 5 miles feels like solving a puzzle.
On paper, “just run more” sounds easy.
In real life… it’s not.
I’ve coached runners who were literally doing laps around office parking lots at 5 AM just to squeeze miles in before their day started.
And even then… it barely fit.
So yeah… people start looking for shortcuts.
And there are plenty of them floating around.
You’ll see stuff like:
“I ran a marathon on 20 miles per week. No problem.”
And sure… that happens.
People finish like that all the time.
But there’s usually a cost.
And it doesn’t always show up until after.
You’re wrecked for days. Sometimes longer.
Your time is way slower than it could’ve been.
And those last 10K… they turn into something else entirely.
Not racing.
Just… managing damage.
Walking. Jogging. Negotiating.
It becomes something you endure, not something you run.
And I’m not saying that to take anything away from finishing.
Finishing matters. A lot.
But you’ve got to be honest about the trade-offs.
Lower mileage… usually isn’t equal to higher mileage if you care about how the race actually feels.
And then there’s this weird internal tension most runners sit in.
You’ve got two fears pulling you in opposite directions.
On one side:
“I don’t want to get injured if I increase mileage.”
On the other:
“I don’t want to show up underprepared and fall apart again.”
And the frustrating part is… both of those fears are valid.
They don’t cancel each other out. They just sit there.
Make every decision feel heavier than it should.
I’ve felt both. Still do sometimes.
The goal isn’t to eliminate one of them completely.
It’s to find that middle ground.
Where you’re building mileage slowly enough that your body actually adapts…
But still giving yourself enough volume to be ready for what the marathon demands.
And that balance… it’s not the same for everyone.
That’s why copying someone else’s mileage rarely works the way you think it will.
Because you’re not copying their body.
Or their life.
Or everything they’ve already built before you saw their numbers.
Why Weekly Mileage Matters (The Science)
If you step back for a second…
The reason mileage matters isn’t complicated. It just feels complicated when you’re in it.
Endurance comes from volume.
That’s it.
You can see it when you look at elites.
Back in the 1950s, Jim Peters was already running 80–100 miles per week and breaking records. Now you’ve got Eliud Kipchoge sitting around 110–120 miles per week during marathon builds (run.outsideonline.com).
And no, that doesn’t mean you should go anywhere near that.
But it shows a pattern. A really clear one.
The marathon rewards people who put in the miles.
Not the ones who try to hack around it.
And it’s not just elite runners.
There was a 2016 study looking at more than 2,300 recreational marathoners. Same pattern.
More weekly mileage → faster marathon times (run.outsideonline.com).
And when you actually look at it… the gap isn’t small.
Someone running ~50 miles per week versus someone at 25–30… that difference shows up big on race day.
We’re talking tens of minutes.
Not marginal gains. Real ones.
And honestly… you see this without needing a study.
You watch enough runners over time, you just start noticing it.
There was also analysis showing something interesting…
Even runners with similar 5K or half marathon times… perform differently in the marathon depending on their weekly mileage (reddit.com).
So speed alone doesn’t carry over.
That part… I’ve seen a lot.
Fast runners who don’t put in the volume… they look great early in the race.
And then somewhere later… it unravels.
From a body standpoint… what’s actually happening?
It’s not one thing. It’s layers.
You build more mitochondria — basically your energy factories.
More capillaries — better oxygen delivery.
Your body gets better at using fat as fuel… so you don’t burn through glycogen as fast.
And over time… your running economy improves. Each step costs a little less.
Even your tendons, bones, ligaments… they all adapt.
But here’s the part people don’t like hearing:
That stuff doesn’t come from one hard workout.
It comes from showing up… over and over… for months.
Consistent mileage does that (run.outsideonline.com).
Not random effort.
And how you run those miles matters too.
There’s this idea — 80/20.
About 80% of your running is easy.
20% is harder.
Most runners who do well… they fall into that pattern whether they’re thinking about it or not (run.outsideonline.com).
The easy miles build the base.
The harder stuff sits on top.
If you flip that… and chase intensity without enough mileage…
It usually ends the same way.
You burn out.
Or something starts hurting.
Or both.
I’ve done that. Thought I could replace volume with harder workouts.
Didn’t work. Just ended up tired all the time.
But… there’s a limit too.
More isn’t always better forever.
Going from 20 → 40 miles per week? Big jump. You feel it.
40 → 60? Still helps. But less dramatic.
And then eventually… you hit a point where more miles just means more fatigue.
Especially if you’ve got a job, family, bad sleep… real life stuff.
For a lot of recreational runners, somewhere around 60–70 miles per week… things start leveling off.
And injury risk creeps up if you’re not careful.
Very few non-pro runners can hold 70+ consistently without something breaking down.
Sleep. Energy. Motivation. Or just your body.
So yeah… more mileage helps.
But there’s a ceiling.
And the right number… isn’t the highest number you can survive.
It’s the highest number you can repeat.
Week after week.
Without falling apart.
For some runners, that’s 50 miles per week.
For others, maybe 70.
For beginners… it might be 30.
And that’s fine.
That range… it grows over time.
If you stick with it.
If you don’t rush it.
And yeah… that part’s hard.
Weekly Mileage by Goal – Finding Your Range
How many miles you should run each week… it depends.
I know that’s not a satisfying answer. It never is.
But it comes down to what you actually want out of the marathon… and where you’re starting from.
And a lot of runners skip that part. They just grab someone else’s numbers and try to force them into their life.
That usually doesn’t end well.
So instead… think in ranges. Not rules. Just patterns I keep seeing over and over.
If your goal is just to finish…
Especially in that 5+ hour range…
Somewhere around 30–40 miles per week at your peak usually works.
Assuming you spread it out over at least four days.
That level shows up a lot in beginner plans for a reason. It gives you enough time on your feet. Enough exposure.
And if your long run builds up toward 18–20 miles… yeah, you can get through it.
I’ve seen plenty of first-timers finish on ~35 miles per week.
Not always pretty.
But it works.
If you want it to feel… a bit more controlled…
Like finishing mid-4 hours without completely falling apart…
Then pushing closer to 35–45 miles per week starts to matter.
At that point, you’re probably running five days a week.
You’ve got a long run. A couple medium runs. And those medium runs… they don’t look important on paper.
But they add up.
They build that quiet fatigue. The kind that teaches your body how to keep going.
And late in the race… instead of everything collapsing at mile 22…
You’re still tired. Of course you are.
But you’re moving forward. Not negotiating every step.
Now… sub-4.
This is where things shift a bit.
That’s about a 9:09 per mile pace.
And most runners who get there… they’ve spent time in the 40–55 miles per week range.
Can you do it on less?
Yeah. Sometimes.
If you’ve got a strong background. If you’re efficient. If things go right.
But it’s less predictable.
Once you’re in that 45–50 range… you’re not just building endurance anymore.
You can actually practice race pace while tired.
And that’s a different level of preparation.
Usually that means five or six days of running per week.
And no… you don’t jump there overnight.
If you try… your body usually has something to say about it.
Then you start looking at 3:30, 3:15… faster than that…
And yeah… mileage becomes less optional.
More expected.
Most runners in that range are peaking at 50–60+ miles per week.
Some even higher… but usually after years of building.
Six days a week running becomes normal.
Sometimes even doubling — two runs in a day — just to spread the load.
But what people don’t see… is the history behind that.
Nobody just wakes up one day and handles 60 miles per week cleanly.
There’s always a build-up. Years, usually.
And all of this… it’s not fixed.
These aren’t laws.
Just patterns.
There are always outliers.
I’ve seen a runner go 3:10 on ~35 miles per week.
But he had years of speed behind him. Super efficient.
Kind of an exception.
And I’ve coached someone who needed over 60 miles per week just to break four hours.
Not naturally fast… but could handle volume.
Different bodies. Different backgrounds.
So your range…
It depends on:
Your history
Your body
Injuries you’ve had
And honestly… your life outside running
Work. Family. Sleep. Stress. All of it.
And it changes.
What worked for your first marathon… probably won’t be enough for your fifth if you want to improve.
So yeah… use these numbers as a starting point.
Not a target you have to force yourself into.
Alright… this next part is where people usually mess it up. Not because it’s complicated… but because it’s boring and requires patience.
Let’s go.
Building Mileage Safely – How to Increase Without Injury
Once you decide you want to increase your mileage…
This is where things tend to go sideways.
Because motivation shows up… and patience disappears.
You start feeling good for a week or two… and suddenly you want to jump ahead.
That’s usually when something breaks.
The idea itself is simple.
Build slowly.
Give your body time.
That’s it.
But actually doing that… is harder than it sounds.
First thing… you’ve got to be honest about where you are.
Not where you wish you were.
Where you actually are.
If you’re running around 20 miles per week right now… you can get to a marathon start line in 12–16 weeks.
But only if you build carefully.
If you’re below that… especially if you’re newer…
It’s smarter to just build a base first.
Maybe go from 10 miles per week → 20–25 over a couple months.
Not exciting.
Doesn’t feel like “training for a marathon.”
But it’s what keeps you out of trouble later.
When you start increasing mileage…
The biggest mistake is trying to do too much too fast.
People talk about the 10% rule.
Don’t increase more than 10% per week.
And yeah… it’s a decent guideline.
But if you follow it blindly every week… it doesn’t always work.
What I’ve seen work better…
Is more flexible.
Something like:
Week 1: 25 miles
Week 2: 30 miles
Week 3: 33–35 miles
Week 4: drop back to ~28
Then repeat that pattern.
Two steps forward… one step back.
That step back… matters more than people think.
Those cutback weeks — dropping mileage by 20–30% every 3–4 weeks —
They’re not weakness.
They’re what keep you running.
I used to hate those weeks.
Felt like I was losing progress.
Like I should be pushing instead.
But every time I ignored them…
Something started hurting. Or I just got flat.
Now… I almost trust those weeks more than the big ones.
Because they’re what let you keep stacking months.
If you’re building toward something like 45–50 miles per week…
Your week starts to take on a shape.
Not perfectly. But there’s a pattern.
You’ve got your long run.
That’s the anchor.
Everything else kind of orbits around it.
It builds gradually… maybe starting at 8–10 miles…
Eventually getting up to 18–20.
Most runners don’t need to go beyond 20.
And honestly… going longer sometimes just creates more fatigue than benefit.
A few runs in that 18–20 range… that’s enough.
Then there’s a workout day.
Usually once a week.
Sometimes every other week early on.
Could be tempo. Marathon pace miles. Intervals like 4 × 1 mile.
These help… but they’re just one piece.
If you try to stack too many of these…
You end up tired all the time.
And then your mileage suffers anyway.
Then there’s the midweek run.
8–10 miles. Easy.
This one… people underestimate.
It doesn’t feel special.
But it builds endurance quietly.
And sometimes… it feels harder than expected.
Not because it’s fast…
But because it sits on top of everything else.
That accumulated fatigue… it’s doing something.
The rest of the week?
Easy runs.
And this is where a lot of runners mess it up.
Easy runs are supposed to feel easy.
Like… almost too easy.
You should be able to talk. Breathe comfortably.
Sometimes even feel like you’re not doing enough.
It took me years to accept that.
I always felt like I should be pushing more.
But every time I ran my easy days too hard…
Everything else got worse.
Long runs felt worse.
Workouts felt worse.
And eventually… my body pushed back.
If you can’t run 5–6 days a week…
You can still make progress on 4.
You just combine things.
Maybe add tempo into a longer run.
But as mileage increases…
It’s usually better to spread it out.
Two moderate runs on separate days…
Is easier on your body than one big, heavy session.
Some runners start doubling — two runs in a day.
That works… but it’s more advanced.
For most people… just adding another running day is enough.
Then there’s the taper.
And this one… people either skip… or mess up.
Because it feels like you’re losing fitness.
About 2–3 weeks before race day…
You hit your peak week.
Then you start reducing mileage.
Usually 20–30% each week.
So if you peak at 45…
You drop into the 30s… then maybe ~20 in race week.
You keep a little intensity. Not much.
Just enough to stay sharp.
It feels weird.
You start second-guessing everything.
“Am I losing fitness?”
But you’re not.
You’re finally absorbing all the work you already did.
Cross-training… it helps too.
Cycling. Swimming. Elliptical. Pool running.
I’ve swapped runs for pool sessions when my knee started acting up.
Kept things moving without making it worse.
But here’s the thing…
At some point… you need to run.
Because nothing prepares your body for running… like running.
Your muscles. Your tendons. Your bones.
They need that specific stress.
Cross-training supports it.
Doesn’t replace it.
I still remember my first 18-mile run.
It felt like a huge deal at the time.
Got up early. Around 5 AM.
Trying to beat the heat.
Carrying water. Gels. Not really sure how it would go.
I kept it slow.
Didn’t think too far ahead.
Just one mile at a time.
And when I hit 18.0…
I was tired. Yeah.
But I wasn’t empty.
I was still standing. Still moving.
There was something left.
That moment… it did something in my head.
More than anything else.
I stopped wondering if I could finish.
And started believing that I would.
Not comfortably. Not easily.
But realistically.
That’s what these miles do.
They take something unknown…
And slowly turn it into something familiar.
Piece by piece.
And that’s why mileage matters.
Not because it looks good on paper.
But because it changes what feels possible.
Alright… let’s keep going. This part isn’t really about miles on paper anymore. It’s what sits underneath all of it.