I've done two centuries. Time on one was 9.5 hours, included 7.5 hours ride time. Time on the other was about 11 hours, not sure where all of that went, still about 7.5 hours riding. Those were flattish centuries, 1500-1800' or so. The first one was the Hotter-n-Hell 100 in Wichita Falls. That's a terrible time for it, but I still had lots of company out there, too.