World of Warcraft - its an ugly, ugly addiction that I am glad I kicked.

hmmm. I think I would have to go with World of Warcraft.

20 days on my main priest alone. Thats 480 frickin hours!

I have no idea how much time has been buried in Diablo II, Legend of Zelda, Legend of Zelda II, Punch-Out!!, and Super Mario (1-3, Land).
Aprox. 180 hours on Wayne Gretzky 3D Hockey, 150 on NHL Hitz 2002. About 100 Hours on NHL Hitz Pro. 240 hours on Final Fantasy XI (uhg!).

My best Guess would be if you combined Arcade and NES usage of TMNT the arcade game than that would EASILY be 2nd place.

I. Ragnarok Online (PC) was the only MMO I stuck with for years, so that would be it. No idea how many actual hours, a lot.

II. Disgaea: Hour of Darkness (PS2) - 112hrs
(Disgaea: Absence of Justice might pass it but as of now still at 77hrs)

III. Persona 3 FES (PS2) - 98hrs. This is "The Journey" only.

Fire Emblem 7 (GBA)

Hard to say. Probably Advance Wars Dual Strike on DS. Or Street Fighter 2 on arcade. I used to spend almost everyday for like two years at the arcades playing that game.

Final fantasy 7, i when over 99:59:59 hours for months(must have gotten around 500+), twice and got more than 99,999,999 gill, got all the materia mastered and knight of the round, final attack and phenix for each character, had all the stats at 255, need i say more??

Update: Oh and xmen vs street fighter the arcade, around 150 hours, and WOW around 400 hours

This time I play Warhawk but the game i spend more time on is Phantasy Star online ep. I&II
One complete summer nolive on... ;)

Legend of Dragoon for PS1. Man, I love that game. Played through it at least four times and spent a solid 40-50 hours playing each time. Man, that brings back good memories.

Hrmm a tough one...

Well for me it would have to be a toss up between...

Goldeneye and Perfect Dark's multiplayer modes on N64 - me and my little bro used to kill hours on end on those.

Although the original Mario-Kart on SNES (Yes I am really that old!) would give them both a run for their money (again multi-player).

Everquest, City of Heroes, or WoW.

I do not even want to think of the total number of hours.