I'm actually tempted to break it if that still is the record, but would it have to be a multiplayer game? or can it be done in hotlapping? I suppose it could be easy to fake either way. Are food breaks allowed? :P
Longest I've played a singleplayer game on a single day was around the 18h mark (Knights of the Old Republic), 20h for multiplayer game (World of Warcraft) but those were with dinner breaks etc, and I can eat while autorunning, but I can't eat while racing