Yeah timing can be crucial on a 600K. Above that you get plenty of bonus time, below that sleep isn't necessary so you don't have to plan for it. I usually fit in only 3-4 hours sleep on my 600k rides.
Looking at the math of things, from 200k to 600k you're given about 14.8-15 km per hour, so if you're just barely making time for 200-400k, 600k will be a problem as there are no provisions for extra time. Whereas at 1000k, if you go by the 15km per hour of the shorter events that only accounts for 67 hours so you have 8 "bonus" hours for sleep.
Last edited by atwl77; 06-08-21 at 09:58 PM.