Just a curiosity really. As I'm sure you all know, Steam tries to tell you how long you've been playing a game for. My longest is 98 hours on Killing Floor. Although at the rate I've been playing Dota 2 or CS:GO recently, it'll probably get overtaken in the next month or two...
Call Of Duty: Modern Warfare 3, 184 hours. Oh god. I need to go commit Seppuku. Token mention to Fallout 3, at 2 hours total, despite spending well over 300 in game due to FOSE not running through steam.
football manager 2011 - 1429 hours football manager 2012 - 1347 hours football manager 2013 - 741 hours and counting. it'd be something similar back to 2007, and more before then (as i wasn't working full time) but i didn't have them registered with steam.
Skyrim - 237,7h Left 4 Dead 1 - 96,2h Anno 2070 - 82,6h Not Steam, but before my computer got fried recently Minecraft had a playtime of around 27 days. Kinda scary.
holy sheet haha! 289hrs - CSS 191hrs - Skyrim 400+ hrs oblivion xbox + PC combined 140hrs - GTA IV + DLC This was all whilst in school/college and a part time job, now I'm fulltime I probably average 10 hours a week across a few games if that
907 on TF2 Then 82.6 hours on Warband, although I played quite a bit before I got it on Steam so that should be higher. Bother Anno 2070 and 1404 aren't on steam, and they'd both be 100+ I reckon.
Team Fortress 2 at 64 hours - Although, this is low really as I am still kinda new-ish to PC gaming. I'm sure at the end of the year it will be considerable higher
Uh, 1313 Hours, ish, it's a little more than that, probably by about four hours or so, I couldn't be asked to work out the minutes for each game. That's across my 60 odd games. Most of it comes from the Call of Dutys (Black ops, Mw3, BOII) & Fable III. There's roughly five hundred hours across those alone. The other runners up are Saints Row: The Third, Audiosurf, Half Life 2 & Thief: Deadly Shadows.
Around 2,5 thousand hours, but i am pretty sure Steam missed tracking of another 100-200 hours or so (Fallout 3 at 4.5 hours or AC2 at 3.5 hours is a nonsense).
Mount & Blade: Warband:541 hours Empire: Total War: 446 hours Rome: Total War: 483 hours In total I am certain that Rome is the game I have put most hours in as I owned it for a few years before I got it on steam.
My top 2: Battlefield Bad Company 2 - 251 hours. Borderlands 2 - 107 hours. Back when COD4 was out, X-fire clocked about 7-800 hours.