I was under the impression we have a member here on DW who has a world record for this sort of thing? Except I thought he played for something like... a week, two weeks straight? Then again, this record says "longest drum session held in a RETAIL store", so perhaps that's the kicker.
The other guy's record was waaaay longer, but the details didn't seem very honest to me. He was allowed to take breaks away from the kit to eat and even nap as I remember. I like my endurance events to be hard-core.