I've spent most of my time on the Dynasty Warriors series, GTA series, Mortal Kombat series.
I put so much time into all those games. They are still fun though. I still play on occasion to just free roam in GTA and do random illegal things. And with Mortal Kombat it's fun to just fight people and play with friends. With Dynasty Warriors though. I don't play that much. Only when someone else feels like playing with me. Once you beat the story on that game it seems boring to continue playing it.
have about 6 days on waw, half a day on mw, never got into it, about 10 days on mw2, maybe more, 4-5 on bo already, and im currently addicted to fallout new vegas with about 2-3 days. i got it on christmas :P
I spent about 2 weeks playing the first splinter cell on the original Xbox. That game took me a while to beat. Mainly because I was younger and didn't fully understand what to do on it.
But I've replayed it and I beat it in about 4 days.
The other splinter cells though still take me a while to beat. They've made a lot of those games. Other then Dynasty Warriors, splinter cell comes in first.
I played the Hell out of MW2, about 17 days. I thing Halo 3 is by far the game i played the longest since it was my first love. There is not time keeper, but I would say roughly 25-30 days of total play on that. Custom Games is still fun to this day.
Super Smash Bros. Brawl, i once got a 100 hour of multiplayer brawls trophy while playing with a friend and im like, "errr, lets just ignore that award...", also add 10 hours in subspace emissary and that's a lot of time playing the same game.
For me Morrowind wins by an ASTRONOMICAL gap. When I first got pokemon crystal i had about 300 hours on it. Then when I was 13 I discovered Morrowind and up to this day my total hours exceed a thousand+++, as on file alone has 83 hours. Combine that with the fact that I have had well over 100+ characters in all.
I played Red Dead Redemtion straight untill beat. Around 15 hours I think, Maby more. Medieval 2 total war might be my best, at 65 days of play time... counting frinds who played it on my PC.
hmmmmmm, thats a hard question, well either duke nukem for 64, oooooooor legend of dragoon for ps, not ps2 or ps3, but the ps. i mean, the games these days arent as good as those old ones, but there is one that is catching up, cod black ops(and most of that is the zombie mode). id say that if i put added all their time up, it would proly equal up to 400 hours of time, mostle the older ones.