What Steam game have you the highest playing time?

probly Skyrim? havent checked though.

1) LORTRO - 182 Hours
2) TDU 2 - 107 Hours
3) ETS 2 & Civ V & Terraria - 32 Hours

Arma 2: Operation Arrowhead - 364 hours mostly because of the DayZ mod.

Crusader Kings II - 173 hours.

Sid Meier's Civilization V - 148 hours.

Euro Truck Simulator 2 - 97 hours.

Ofc TF2 - 1500 hours, then Half-Life 3 with 500 hours

Barbie: Dreamhouse party - 4,085 hours.
Oh, wait - it's Counter-Strike :(

CS 1.6 - 1248 hrs
CS:GO - 168 hrs
TF2 - 34 hrs
A.V.A - 21 hrs
SPAZ - 16,8 hrs

1.Counter Strike: 4.607 hrs
2.Killing Floor: 754 hrs
3.Team Fortress 2: 533 hrs
4.Civilization IV: Beyond the Sword: 336 hrs
5.Civilization V: 279 hrs

Garry's Mod

Resident Evil 5 (30 hours)

Company of Heroes.

Disk version around 450 h
Steam Version 462 h
Steam Version Reloaded 160 h

TF2 With 497 hours, then CSGO with 87, and in 3rd - Euro Truck Sim 2 with 58 hours

1. Football Manager 2010 - 10794 hours
2. Football Manager 2009 - 2838 hours
3. The Elder Scrolls V: Skyrim - 304 hours
4. Crusader Kings II - 163 hours
5. Mini Motor Racing Evo - 42 hours

Fallout New Vegas - 70+

Dota 2- 734 hours
DayZ mod- 296 hours
TF2- 210 hours
Payday 2- 47 hours

Gmod, but I only play TTT.

1. Dota 2 - 1333 hours
2. Crusader Kings 2 - 138 hours
3. Tf2 (most idle) - 126 hours
4. Europa Universalis IV - 112 hours
5. Skyrim - 108 hours
6. Civ V - 83 hours
7. Tropico 4 - 78 hours
8. CSGO (most idle) - 77 hours
9. Last Remnant - 70 hours
10. Mount & Blade: Warband - 57 hours

Beat Hazard - 177 Hours
TES: Oblivion - 96 hours
Audiosurf - 60 Hours
Everything else is under 30 hours.

Terraria - 434 hours
The Binding of Isaac - 346 hours
Borderlands 2 - 127 hours on Steam. I had like 300 before actually buying it, I transferred the saves.
Darksiders 2 - 85 hours

Dungeon Defenders !

TF2-1398 hours(considering to quit)

Dota 2- 253 hours(Moving on to dota 2 now)

L4d2-65 hours(quitted)

Anything else is <48 hours

BL2 with 137h .....

Left 4 Dead, 3700 hrs. Quit!
Left 4 Dead 2, 1700 hrs. Play it every day. :D
Universe Sandbox, 1950 hrs... must clock in 8760 for the one year achievement... - idling all day errday.
CoD: Modern Warfare 2, 1050 hrs... .__. hard to believe it myself.
Killing Floor, 300 hours. Great game.

Of all these, only L4D2 gives me limitless entertainment. I play the same survival map every single day. lol

APB Reloaded 1244 hours. A lot of them is AFK over the night/day when i'm doing other stuff.
Skyrim 462. Damn them mods... Also a lot of AFK when i think about it.. I can't be arsed to level sneaking in any other way that letting it happen over a night or so.
Dota 2 456 hours
CS-Source 406 hours

I guess Fallout 3 and New Vegas would be really high aswell but i used a friends account when i started and then i had a specific launcher that didn't use steam for F3 when i started to mod it.

158 in Borderlands.