Final Fantasy VIII 85 Hours. I played XII up till the Mount Bur Omnisence part and clocked 52 hours, didnt get to finish it (wasnt my copy) but I guess it'ld be slightly longer than VIII.

Pokemon Silver or Ruby. If i remember correctly, I had around around 300-400 hours on each. But then i restarted Ruby and Silver died of old age. (I traded the pokemon off of Ruby first.

I think I have over 1000 hours in WoW.
Console game... Brawl I guess, around 250hours.

FFX
I put in probably a good 100 hours into the game trying to caapture all creatures and trying to get all the Aeons

Well Xenosaga episode 1 0r 2 i cant remember exaycly, was the longest game i ever played. Then Jet force gemini for 64 and fallout 3 with all the new add ons i think will be tied since ive yet to complete fallout 3.

Final Fantasy X. I am still playing it. Thats how long it is.

so far Iv sunk 100's of hours in Pokemon (Red/Blue) and about 200 hours in Brawl

Animal Crossing starting to get there too

"Hack" series! I dont remember a whole lot about the game seeing it was over five years ago. But i do remember putting a whole shii load of map inputs that took me to the most random and craziest locations in existence.

Coming to think of it, I never heard anyone ever mention this game!

Lots, because I often go for 100% completion on everything.
I took so long with Paper Mario: the thousand year door on the Gamecube that the clock stopped at 99:99. :0P

If we're including MMORPGs, I spent about 1000 hours on Maple Story over 3 1/2 years before I quit. If we're not, I think I spent 150 on Crystal. Below that comes Twilight Princess at about 70 (I finished it the first time in 45 hours, and I'm almost done with a second run through).