CoD4's Singleplayer is 5-6 hours...

[naznatips]

rocketpig said:
Anything under 8 hours for a game with good multiplayer is unacceptable in my eyes.

Anything under 12 for a single player only game is also unacceptable.

Hrmm.  That's a pretty good standard.  I think I'll steal it from you lol.