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Without cheating, it is probably Dead Rising with 16 hours trying to get that 14-non-stop-playing hours achievement. Had to pause at times, plus loading times, I guess it got up to two hours.

 

Cheating, and by this I mean giving the controller to a different person (but still watching the game, not leaving or sleeping), almost 50 hours trying to do the whole Gears of War trilogy in co-op (Judgment hadn't released back then). Since we were three dudes, one had to wait a bit before getting the controller, and he could take small breaks like going to the bathroom or getting something to eat. So you could relax the body a bit.