Photo: Bob Martin for London Marathon Events

1:59:30.

That’s what it took Sabastian Sawe to run a marathon (41.2km) in London on Sunday. The first sub-two-hour marathon under race conditions. Yomif Kejelcha came home eleven seconds later, also under two hours. The previous world record - Kelvin Kiptum’s 2:00:35 - had stood for less than three years.

What you watched, if you watched it, was elite marathoners doing what they always do. Looking smooth. Looking relaxed. Looking, almost, manageable.

Then you looked at the clock.

Because what’s actually being held out there is relentless speed sustained for an absurd length of time. Sawe averaged roughly 2:50 per kilometre, around 4:34 per mile, and held it for 26.2 of them in a row.

That’s not just quick. That’s sustained violence against fatigue.

Put it in track terms: 68-second laps, evens, for over a hundred and five of them. No fade. No surge. No tactical break in the rhythm. The kind of clock work most coaches would prescribe as a session, not as a race.

So the question isn’t “could you run that pace?” The real question is… how long could you stay on his shoulder?

Let’s break it down

At Sawe’s pace, everything compresses. Distances you normally associate with effort suddenly become survival tests.

Over 10 metres, you’re fine. Barely a thought. Stretch it to 50 metres, and it’s still manageable. A short burst most reasonably active people could handle. But by 100 metres, something shifts. At roughly 17 seconds, the pace isn’t a jog any more. It’s a pace you can’t drift into. You have to commit to it.

Where it starts to hurt

By 200 metres, in 34 seconds, you’re working properly. This is faster than many casual runners can sustain for a full rep. Double that to 400 metres - 68 seconds - and you’re at a clear turning point.

For a recreational runner, that’s a hard effort. For a club athlete, 68 seconds is a controlled rep, the sort you might tick off in a 10 x 400 session with a decent recovery between each. For Sawe, it’s lap one of more than a hundred, with no recovery at all.

Push on to 800 metres in around 2:16, and most gym-fit people are done. Not just easing off, completely spent.

The illusion of “just a steady pace”

This is where things become uncomfortable for serious runners. At 1500 metres, you’re hitting around 4:15. Over a mile, roughly 4:34.

That’s competitive club racing pace, and within touching distance of national-level masters performances. A 4:34 mile is the sort of time many strong British club runners build a winter towards. Sawe is doing it without slowing down.

There’s no surge, no kick, no finish-line relief waiting. Just more of the same.

Where even good runners break

Extend the pace out to 5000m, and you’re looking at roughly 14:10. Over 10,000m, about 28:20.

Now you’re firmly in territory where strong club runners are flat out, and semi-elite athletes are working at their limit. Sawe, meanwhile, is still settling in.

Here’s the framing for a track audience. A 14:10 5K is a respectable open-race time for a strong club distance runner, the kind that can win a county-level 5000m on the right night. Sawe ran it eight times in a row. Same rhythm each time. No second one is slower than the first.

The brutal reality

By the time you’ve run a half-marathon, the clock reads 59:45. You’ve filtered out almost everyone on the planet.

For context: Sawe’s average half-marathon split is more than three minutes faster than the women’s half-marathon world record (Letesenbet Gidey, 1:02:52). He ran two of them back to back, on London streets, in standard race conditions.

Then comes the second half. Same rhythm. Same metronome. Same gap opening between him and history.

So… how long could you last?

Be honest with yourself.

A casual runner would feel it inside 200 metres and start looking for an exit not long after. A regular gym-goer might cling on for a 400. A solid club athlete could rep one or two 400s at the pace, but not back-to-back, and the idea of holding it for a full mile starts to look foolish. A national-class masters or sub-elite distance specialist might hang on for a 5K, somewhere around 14:10, before that perfectly even 68-second rhythm grinds them off the back.

The next time you watch an elite marathon, don’t think of it as a slow event compared to sprinting. Think of it as a pace that would drop most of us in under a minute, held for 1 hour, 59 minutes and 30 seconds.

At Sawe’s pace: the splits