Whats the longest time you've ever played a game straight?

Atleast 24 hours.

CoD 4 for 4 hours..

I played FFXII for 14 hours straight once.

I played Halo 2 straight through (about 8 hours), a buddy of mine had a modded Xbox and got the French leaked copy of the game, I beat the game a month before it hit store shelves :D Also I remember countless all-nighters (at least 10-12 hours) playing the original Super Smash Brothers on N64 and playing Rush 2049 all night as well with my brother and 2 friends.

8 hours