i know ultra distances don't get a ton of fanfare on this board, but this is remarkable. this guy is an absolute machine. 6:31 pace for 100 miles, 6:32 pace for 12 hours and now 7:15 pace for 24 hours.
how long could you run for 6:30 pace? how about 7:15 pace?
24 hours of 7:15, which includes taking on calories, hydration, bathroom breaks, shoe/gear adjustments, etc... just plan crazy. you can see his splits here: