These are all of the games I have personally played that have racked up the most hours, some of which I have hundreds and hundreds of hours of playtime:
Morrowind (and the two expansions) Oblivion (with Shivering Isles and Knights of the Nine) Skyrim (Dawnguard was meh, Dragonborn is amazing) Fallout 3 (with all DLC) Fallout: New Vegas (with all DLC) Star Ocean: Till The End of Time Dragon Age: Origins (with all DLC) Mass Effect (the entire trilogy will get you around 100 hours)
And then the two I'm not so proud of: MMO's. Particularly Ultima Online way back when, and World of Warcraft, But no more...
Every FF game beginning with the PS1 games are 80 hours, (this includes sidequests) unless you are just not that good at the game.
Eh, majority of the FF titles aren't *that* long. The PS1 games I can manage to beat in 20-25 hours a piece. To 100% them, maybe add another 5-10 hours to that total.
FF12 is probably the longest FF game, in my opinion.
IRON MAIDEN IS MY RELIGION! Gamertag: Demigod Elessar (I was formerly Demigod Tyek on these boards, and as a gamertag)
From my experience, Fallout 3, Persona 3 FES, Tales of Vesperia, Just Cause 2, Red Dead Redemption, and FF XII took me almost to 100 hours on my first playthrough because I like to grind/powerlevel and explore. (All of them an average of about 80 hours)
The only game that took me 100+ hours to beat on my first playthrough was Persona 4. Grinding for money to purchase equipment and to fuse Persona's was a hassle and I always tried to match the boss' level because losing against a boss in a JRPG isn't my thing.
I actually never heard of the infinite Great King trick until recently so while everybody was getting exp and money automatedly, I was doing it the old fashioned way. It takes a tole on your insanity at the end...
"185 battles just to f'in level up Futsunishi for Firm Stance. FML"
--- "Dating Yukari Takeba is, like, the closest thing to dating Michelle Ruff, so I don't see the reason why not."- My brother XD