I'm fairly sure I have a similar number in BG2.
Hell, I have over 300 hours in ME2 ;D
Dragon Age: Origins
265.3 hrs on record
This includes Awakening hours, I imagine, since they run off the same executable. I apparently really liked DAO.
Fallout: New Vegas
143.3 hrs on record
Mass Effect 2
116.6 hrs on record
I guess I should spread those TF2 hours to other games.
i've got about 180 in FNV, 100 in FO3, 100+ in Morrowind, 100+ in Oblivion, about 200 in Guild Wars, another 50 in the expansions, probably about 150 in dragon age
the game with the most amount of hours though? probably Street Fighter 4. I have about 300 hours in that game (well, if you combine SF4 and SuperSF4)
back in the day i spent a ton of time in starcraft, fallout 1-2, TIE Fighter, and a bunch of other games, but i didn't keep track of time back then so i have no good clue as to how many hours I actually spent on those games. Actually, I just realized that if you add up all the times I've played FF7, Planescape Torment, and Deus Ex, you probably have over 300 hours each.... hmmmm