What Steam Game Have You Spent The Most Hours Playing?

World of Warcraft ive been playing it around 5 years by now, I use to be hardcore playing like 5-10 hours a day so easily I have about 4k+ hours on it

Sims 3 with 240 hours. That's nothing compared to my WoW time, though. (Which is over 4000)

Dota 2

107 hours in Skyrim.

~180h in Terraria

Sleeping Dogs! Right now I have about 26 hours with TF2 close behind. But the TF2 hours came from a glitch I had that when I closed the game the process kept on running and I kept on getting more hours.

480 hours on Terraria.

Counter Strike Condition Zero - 888 Hours

1068 hours of DOTA 2. Played a lot when I got it, 50-100 hours a week. Gotta get back to it.

Actually playing: Team Fortress 2

Idling: Dota 2

Star Trek Online - 875.7 hrs on record <,<... You would too if you had ship like the USS Nyan Cat and the USS Narnia.. xD

According to steam TF2, but most of that time is from idling.
Blacklight Retribution is the real one, >400 hours. :D

150hrs on BF Bad Company 2

Counter Strike Source for sure more then 1000 hours

110 hrs skyrim
750 hrs Star wars the old republic
120 hrs fallout new vegas
And many more :)

DC Universe Online - 500 hours.

tf2 6600 hours

Left 4 Dead: 131.3 hours

Skyrim: 112.4 hours

Titan Quest: 95.3 hours

Planetside 2: 62.2 hours

Torchlight: 60.7 hours

TF2 - 465 hours.

Left 4 Dead 2 - 240 hours (I can't believe how dumb I was to play this for so many hours)

Binding of Isaac - 269 hours.

Combat Arms - 4821 hours

Counter Strike: Source - 990h

Team Fortress 2 - 694h

Garry's Mod - 315h

Saints Row: The Third - 47h

TF2 +300h
now i use to play BF3, so... :)

cs 1.6 200 hours on Steam and 5-6 years nonsteam.

On steam, CSS but only because I only really started using steam about December of 2012.

Off steam, either GTA Vice City or Runescape...

You need to play more ChiChi <3
Terraria and BL1 for me ^__^ ech at 136 hours