I think I've spent over 300 hours on Devil May Cry 3 :P... but I'm not sure because the save file would only show 99:59:59 because it seems like it's the maximun ammount of time it can show :S.
I also played Super Dancer Online China, Dance! Online and Stepmania for countless hours :P... I used to be so good at those games >_
I think I played FFXII for like 250 hours... but that's 2 playthroughs... my first, normal playthrough and my 122333 challenge playthrough :P.
Sorry about my crappy English ^_^