Due to the logistics of getting volunteers in and out of the aid stations, some of the slots are 12 hour shifts, if not longer.
The folks at A-Frame and Barr Camp typically stay overnight for the entire weekend, often hiking in late Friday and leaving Sunday evening.
The Cirque, Bob's Road and Noname crews depart Manitou at 5am, are onsite at 6am and typically don't get back down until around 5pm.
Thus when we start to offer margaritas at the cirque, it is often because we are just as delirious as the runners. :-)