> While the other competitors stopped to sleep for six hours, Young kept running. He ran continuously for five days, taking the lead during the first night and eventually winning by 10 hours
https://www.runnersworld.com/news/a37465691/sania-sorokin-24...
There are also 48 hr and 7 day races. Sleep is necessary somewhere between those two points, though two guys just went 85 hours with basically no sleep:
https://www.bigsbackyardultra.com/
That's a race where every hour on the hour you have to complete 4.166 miles. You get as much rest as the balance of your time after you complete a lap till the next hour begins. Most competitors complete a lap in around 48-52 minutes. The race continues until there is only one runner left to complete a lap.
https://www.farmprogress.com/blog/cliff-young-farmer-who-out...
> Previous estimates, when accounting for glycogen depletion, suggest that a human could run at about a 10 minute per mile pace, which allows existing fat stores to be converted to glycogen, forever. The only limit to our eventual mileage, therefore, is our need for sleep. https://nikomccarty.medium.com/how-far-can-humans-run-d5c97f...