The guy must be in such supreme physical condition. Also, I think someone else did 22 laps.
Apparently the official count has David Powell on 22 laps (rigid geared 29er) and Aidan Harding on 21 (singlespeed). Even so, that's lots and lots. If you want to get some idea of training and preparation, Dave's got a blog thingy at http://www.twinklydave.com/wordpress/. Some quite extensive rides in there 
That's a sub 1hr lap every hour for pretty much most of the 24hrs. Boggles the mind.
22 laps over 24 hours = 1:05 per lap. Looked at another way, 22 laps was 191 miles, so that's an average speed of 8.7mph (including stops). Part of the trick is not stopping much - while my stops tended to be 20 minutes of snacking, faffing and going for a pee, Dave was pretty much just swapping bottles and picking up food. He was aso riding faster, which helps
Flat out I think I'd be capable of a 43 min lap or thereabouts, so to be able to sustain such a cadence is beyond my ability to comprehend what that'd be like to ride at that level of ability.
Well, there's a substantial difference in required effort between 43 minutes and an hour. That said, I'd done four laps within the first four hours and that certainly wasn't a pace I could sustain - nearly 14 hours to reach 10, then the rest of the event to eke out the final four.
Dave's scary, though, he looked exactly the same at the end of the event than at the beginning. He could have at least had the common decency to look slightly tired 
