What's your highest playtime in a game?

4149 hours on World Of Warcraft

Killing Floor - 432.5 hours and counting

All TF2 +2000 hours are idlers...I wouldn't count that as "play" a game.

Call of Duty: Modern Warfare 2 - Multiplayer
1,351.5 hrs on record

3600 hours Warcraft III TFT

Garry Mod - 175 Hours

1k+ hours in TF2, that kinda scares me that I have only had that game for 4 years.

Skyrim 233 Hours.

542 hours in Counter-Strike 1.6 xD

TF2-253.6 hours Civilization V-222.6 hours Would be more if my computer didn't shut down all the time

CoD MW2 427 hours. But I think I got more in CSS but it's just not recorded.(steam did not record stats in the past)

1300 hours of cs 1.6

Minecraft , 1 year (but that aint steam)

CS 780 HRS

Quake Live for 1.8 months, not sure how long is that.

mw3 - 421h :D

Garrys Mod 1288 Hours

2,457.2 hrs in 1.6 and many hours in Q3 back in the days. ;_;

17.5 hours in TF2

Binding of Isaac with a whopping 77 hours... YEAH ONLY 2 NUMBERS!!!!

TF2 - 1541 Hours

Team Fortress 2, 2325 hours

fm 2012 - 82 hours

MW2 6481 hrs - not on the PC

Spiral Knights - 669 hours // CS:Source - 268 hours // TF2 - 217 hours // BF2 - 179 hours