lol... this is easy for me ... Final Fantasy XI somewhere over 300 days in game time.

Hmm...well, the NES Megaman games and Zelda II come into mind immediately...I've spent a number of hours on those trying to beat them in the past...some of which I still have yet to beat (MM7 and Zelda II). In the case of the original Megaman, it took me some 20 years to finally get past the $%#@ing Yellow Devil (not all at once...but I probably spent an hour or two each time I played Megaman until I gave up on it). It took the knowledge I learned from MMHP.net and several more attempts before I finally hacked into it's attack pattern and got rid of that huge nuisance. After that, the rest of the game was relatively easy. Now, whenever I play Megaman, I can probably beat the game in about 1 to 2 hours.

In Final Fantasy VII, a number of hours before I finished the game, I noticed the time on my save was 99:99:99. I broke the timer. Yay! :D Much time was spent trying to breed a Gold Chocobo to get the Knights of the Round summon. It is also the last RPG I played without a cheat device, though on the new systems I don't have a choice.

Same. I had 3 knights of the round from AP leveling so much. And I spent a good deal of time on one underwater lab killing creatures with the item capture ability which produced permenant +1 stats. So not only were all my characters lvl 99, but there stats were all pretty much maxed out.
I didn't cheat, but I"m sure I broke the 200 hour mark.

I'd say Animal Crossing Wild World...simply because I play it before going to bed almost every night and have done so for the course of like...a year

Tough one. Either one of these # Evolved(Best campaign of the three) Elder Scrolls 4 Oblivion, or Mass Effect. Course, Now I've got Fable 2 so that has a few hours put on it already.

Diablo II with Lord of Destruction expansion for the pc. As far as it goes i don't know how many hours i played with it, but it took me several years to finish the game with ALL characters in normal difficulity. (Maybe the hours i spent on that game are more than 1K!!)... Did try it on hell and nigthmare difficulity, but it was to damn hard so i gave up on the game. Nothing was so much fun than killing the minions of hell with each characters special tacics, and gathering loot. LOL As you can guess I totally gonna buy Diablo III, and gonna own Hell's ass once again! In the meantime, i play So Blonde and Fallout 3 since i finished TimeShift.

Oh man, out of all the games I've owned? that's a LOT. o_O Well Final Fantasy 3 (6) Chrono Trigger, the Legend of Zelda 3: A Link to the Past (I always beat the game straight through whenever I was sick.) Lords of the Realm 2, Warcraft 2, Starcraft, Samurai Showdown 4 (Samurai Spirits), Kings Quest 6: Absence Makes the Heart go Yonder,

Thinking about it... I can probably safetly say the #1 game I spent most of my time playing... Tetris.

City of Heroes.

No competition.

Computer: World of Warcraft.
Consol: Marvel versus Capcom 2 (I had to unlock everything yanno)

Fuckin' Oblivion. I played that for... Shit, I don't know how long. Then I made new characters with different major skills, and played them. So... At least several hours gametime, no expansions.

Neverwinter Nights definitely comes in a close second, but that's just because of all the mods that are out there.

Final Fantasy XII, and I didn't start palying it until a year after I got it. 145 hours playtime. Fuckin' ridiculous hunts, with Carrot and all the other level VI's and VII's. Closest to that is probably Super Smash Bros, over 120 hours playtime, possible broke the timer. Backseat to that are Kingdom Hearts 1 and Chain both with 80 houra(FUCK YOU RIKU-ANSEM!!!!)and SSBM, 77 hours.