Hmmmm, if its not WoW, its either Oblivion, fallout 3, Starcraft or maybe mass effect
wow would be on top with 500-ish hours total, followed by Oblivion, 70-100 hours each character, 3 characters, then starcraft, 50 hours. and of course, mass effect and fallout 3, which i bought both recently so i'm still playing them.
awesome games all of them