Anyone done those crazy 24 hour mountain bike races? I did a couple years of the 24 hours in the old pueblo, Tucson AZ. The last one I did as duo back in 2011 and it will probably be my last (unless I do a team category some year and can just do a lap or two). The 16 mile laps were pretty fast - 1 hours for the super fast to 2+ hours per lap for the slow amateurs. I got 6 laps in and was dragging tail at the end. I still remember the 2am lap, hoping my headlight wouldn't give out and wishing it was over. My most concerning issue was my jaw was sore and would would click and feel like it was going to lock up for a couple days after (and a nasty sore throat). Probably because I spent 12 hours with my mouth wide open gasping for air. That's pretty much when I figured out endurance riding wasn't my cup of tea. I've done a few century rides since then and every one of them has been fun at the beginning but pretty miserable towards the end. As they say, it's not the destination, it's the journey!