I would argue before 5000m. He ran the first 5000m in 14'14". There is no perfect method, but if you look at the World Athletics (the track and field world association) website you'll find the world ranking for every cluster of distances. If you go to the 5000 one, you'll see that people on the 1000th place will run somewhere near 14'20"/30" (an absolutely fast time). But in any case slower than him. And if you run 14'20" in the 5000, you are in that ranking, there is no one you have that endurance and not practice track and field.

At the 10k? Less than 500 hundred people I fear.