I've helped at a few 24 hour events. There's a lot of excitement going on all night. It seems to me the biggest challenge would be staying hydrated and fueled so that you don't get messed up. DH had a friend who refused to eat at one point during an endurance race (he's normally crazy, not just during races) and he bonked really hard and started eating pine cones! But don't worry, that won't happen to you. Like I said, this guy was crazy to start with.

DH always did well with those events. Its all about pacing yourself.