I think recumbent riders may be a little bit more diciplined when it comes to longer distances. Since there are so few of us out there and never other recumbent riders to draft in large recumbent pacelines, we must do all our centuries solo if we want to do it fast. I've done a 104 mile time trial solo with a 4:15 and a couple years later in 2010 a 4:06 This year on a different bike I'm shooting for a sub 3:50 solo. Feeding and hydration management will be critical to reach my goal. All the club race rides in the area consist of riders taking short pulls in pacelines. That is not the way to train if you want to do a 40 k tt up to a 12 hour non drafting event. Any type of riding is beneficial, but intervals alone in a paceline isn't going to prepare you for 4 to 5 hours of full tilt effort.