Hi James, to add on to what Brian mentioned about endurance rides, I'd recommend back to back long rides on the weekend. You'd also want to ride at different times during the day - morning, afternoon, night to get used to that. That wouldn't have to all be on the same day though. But to bump up total riding time, you could do a few hours in the morning and a few hours later that afternoon/evening. You could also do a long ride that started in the afternoon on Saturday, and then start the Sunday long ride first thing in the morning. (Then eat and sleep the rest of Sunday!) :) Of course if you are doing it solo makes a difference than if you are on a team. And you'll definitely have to have a nutrition plan and test it out during your training rides to make sure it works. Good luck!
Solo or on a team? I've raced solo 6 times but don't have experience with doing a 24 hour on a team.
James, I attached a couple of articles that were from Peak Region Cyclist. It will hopefully get you started.
This is awesome!! Thanks to all. Colorado Springs does not suck.