Tell me the Game on which you have spent the most hours on steam. xD

I wasted 20 days of my life playing mw3

Deponia 20 hours. Must go play some other games.

Empire: Total War, 403 hours.

Mount and Blade NW 560 hours, Crusader Kings II 140 hours

Team forstress 256 h (100 or more hours spent on loading, bless slow PC) 95 hours in Skyrim, over 90 hours in dota 2 and counting

Counter Strike : over 2000h, then TF2 with 200h :/

64.2 hours of Team Fortress 2. And I'm not even that good... xD

874h in Counter-Strike. In fact it would easily be over 1500h with my old account plus the time I spent playing in internet cafes back in the day. In my personal ranking it's still the best online game ever made.

Team Fortress 2 with 324 hours - Left 4 Dead 2 with 231 hours - Dungeon Defenders with 192 hours

League of Legends 387.3 hours....after that the game stopped updating with the steam version and I had to use the non-steam exe to patch amd play the game^^

Counter strike: source 718 hours :D and Call of duty: modern warfare 2.. 361 hours xD

Dota 2 - 380hours

Counter strike: Source - more than 1000hours
And game out of steam League of legends more than 100 hours too

Skyrim, about 60hours

Killing Floor. 200+ hours.

Counter-Strike:Source
Counter-Strike: Source
4.7 hrs / 3,167 hrs

Super Monday Night Combat 450+ Hours

cs 1.6 1000+ hours :D

Realm of the Mad God 570 Hours
TF2 426 Hours
Awesomenauts 26 Hours
PVK II 13 Hours
Rest are all very low, around 2 or below.
U.U I feel like I spend too much time on games.

Terraria, 240+ hours. And I'm expecting at least the same amount of hours played in Starbound when it's released.

Team Fortress 2 - 198 hours

TF2 - about 315. However, I played loads M&B Warband offline.

Dota 2 - 741 Hrs

TF2 obviously with something around 900 hours. Liking BF3 more ATM though, it's unfortunately not on Steam.