What's your highest playtime in a game?

If WoW counts..... I got 3407 hours on my main character. Dunno how much on my alts tho. Kinda stopped playing this tho.

how can you kill that which has no life?

6000+ hours on Guildwars.
On steam currently 300ish hours on terraria.

164 hours - shogun 2
add another ten offline hours

1275 Hours of TF2.

TF2 ~1900 hours. And I haven't really played much for the last 2 years or so.

...Almost a 1k in Minecraft... Good God, on a decent server you can waste so much time...

1013 hours on license MW2 + 2,5k+ hours in AlterIWNet :P

Plants vs. zombies - 80.9 hours... and I thought that's a lot O.o

Around 1025 on tf2 and 650 on dungeon defenders

4.1k for my main on wow, and a few hundred hours for 5-6 others.

50 hours of fallout: new vegas

Dota2 140h

I have played 5,5 k games on Peggle Peg Party on Xbox Live and about 420 hours on Counter Strike Source on Steam.(Every Peggle game is approximately 10 minutes)

6317 hours (tracked is a bit low, i started tracking a few years later) on World of Warcraft, and i quit it on 2010 january or march

Rusty Hearts- 427 hours... MMOs are evil. O_o

A little over 300 hours on Titan Quest :)

839h Killing Floor :D

400 hours in tf2.

3199 hours in Runescape, but probably 80% of that is my friend since we share accounts and I stopped playing for 3 years (the account is 6 years old.) Also, 2/3 of that time was probably spent in a different tab doing something else :P

Cod2 2800 hours

Counter-Strike with 1124 hours

I played something like 8000 hours of Final Fantasy XI... and then I quit.

left4dead 112 hours