What game have you played most (in hours)?

TBOI: Rebirth, though compared to you guys i'm a filthy casual

Hitman Absolution-79 hrs
Batman Arkham Origins-55 hrs

Just guessing: The Sentinel (Commodore 64 game).

in the last years... diablo 3 - 1300h
in the dos-years maybe civ1 ^^

Fallout New Vegas. 331 hours.

csgo, currently 1157 hours

Saints Row the Third with 66 hours. I used to think that was a lot...

On Steam, it's apparently One Finger Death Punch with about 88 hours...off Steam it could be most anything from Rockstar, but most likely between GTA:SA and Red Dead Redemption with at least 10 times that

Used to play Team Fortress 2 alot. About maybe 200 hours + i think

CSGO with 1106 hours.

Rome Total War is my most played. Can't even count the hours on it.
At small distance is BF3 with a bit more than 400 hours.

Call of Duty 2 - 750 hours clocked on Xfire

Borderlands 2. Over 300 hours...

Football Manager 2013 - 610 hours.

CSGO - 950 hours ( ~200 are from AFKing)

Team Fortress 2 : 921 hours and counting ( and no I don't do idling, just playing ) followed by Warframe with 777 hours and then Payday 2 with 447 hours and lastly Skyrim with 258 hours :)

football, outside the house :)

Ultima online! dont now how many hours but i plyed it 3 year min 12 hours per day :)

Stronghold Kingdoms - 460 hrs on record....

CS:GO 400+ hours

Company of heroes 2 - 562 hours and counting.

Rougly 15000 on Guildwars 1, give or take a few 1000 hours, don't have it installed currently to check.

Either Tetris or Solitaire. I don't have hours to back those up, but I've been playing Tetris for about 25 years, not every day, but I think more than other games put together.