I dunno, probably like 13 hours or something on FFXI. Beyond that like 10 hours or so on various other games.

My freind had a record of 73 hours on FFXI. It was funny to listen to his comments about how he managed it. After that though he set a time limit for any one game before sleep.

But in retrospec he did get like 20 levels or something in that time. >.>