What are your TOP 10 most played Steam games in hours?

Here's mine!
Counter Strike Source - 648 hours

Garrys Mod - 603 hours

Counter-Strike - 460 hours

Counter-Strike: Global Offensive - 303 hours

Zombie Panic: Source - 110 hours

Insurgency - 82 hours

Counter-Strike: Condition Zero - 47 hours

No More Room in Hell - 42 hours

Left 4 Dead 2 - 35.1 hours

Killing Floor - 35 hours
What are yours???!

Wow that's alot of time spent gaming. I have more hours in non-steam games but here are mine.

Garry's Mod - 56 hours

Skyrim - 50 hours

Nosgoth - 36 hours

Fistful of Frags -27 hours

Zombies, Monsters and Robots - 24 hours

Infinity Wars - 16.6 hours

Defiance 14.6 hours

Life is Strange - 12.6 hours

Team Fortress 2 - 11.3 hours

Oblivion - 10.3 hours

@kveldulf: well man i have a friend that has played 16,459hrs on one single fricken game not joking lol.

@drgbugz Jeez that's alot #nolife lol

My Steam playtime is actually a lot shorter than I anticipated:

Torchlight 72 hours

Fallout 3 43 hours

Torchlight II 27 hours

Super Hexagon 21 hours(there are stories behind this one)

Sega Genesis and Megadrive Classics 18.8 hours

Audiosurf 16.2 hours

Reus 13.8 hours

TIE:

Skyrim 10.4 hours(my PC wasn't powerful enough to run it until recently, and by that point I had basically 100% it on consoles)

Sonic Adventure Battle 2 10.4 hours

Portal 2 10.2 hours

Witcher 3 10.1 hours