Not really on topic but I was a minor official at a hundred mile race at Crystal Palace track years and years ago. Jeez that was boring. I had to count the laps for "my guy". Fortunately "my guy" dropped out after a while (it seemed like a very long while) so I was released and went home. ISTR some Russian guy went on to break the record. I don't think any naps were taken.
Many years ago I did back up for Mrs Tenkay a couple of times at Tooting Beck. 24 hours running round a track. The lap recorders had to time and record each lap. They worked in shifts and each runner was introduced to the person who would be taking over their individual lap recording.
They did a remarkable job and there was a great camaraderie amongst both the competitors and the lap recorders.
The second time that Mrs Tenkay competed in the event it absolutely chucked it down for about 16 hours and I had my work cut out helping her change her wet kit, putting it on the radiators in the changing room and calling her back in for a fresh change once it had dried.
One incident sticks in my mind, just after midnight, perhaps attracted by the floodlights, a bloke appeared peering through the chain link fencing. He had been sleeping rough and had more than a few drinks under his belt. He asked what was going on and I explained that everyone was running round in circles for 24 Hours to see who could go the furthest. He thought about it for a while and then burst out laughing saying something to the effect that it was absolute lunacy and absolutely brilliant at the same time.
It did eventually stop raining and the race finished in Sunshine. Mrs Tenkay had managed to keep going and having covered more than 100 Miles is an "Imperial Centurion"