Re: Longest you have ever played video games for?
When I was 9 I got Mystical Ninja: Starring Goemon for my N64, didn't have a controller pak yet (Memory card for non N64 users (Or... dear god, people too young to have played an N64)) so I ended up playing the whole game from start to finish from the minute I woke up one Saturday Morning until like 10 minutes before I went to bed... so like 14 hours.
Although... I may have had longer sessions on Civ IV, that game just sucks time into a fucking vortex of war, Gandhi and Leonard Nimoy.
Hm... 12th Birthday when I got 007 Everything Or Nothing and stayed up with a friend until 8am playing it could also be up there.