This is how long the campaigns took me on Normal Mode, although it may be a big longer than for other people, since I take my time...
Call of Duty 2 - 20 - 25 hours
Call of Duty 3 - 12 hours
Call of Duty 4: Modern Warfare - 8 hours
Call of Duty: World at War - 9 hours
I hate how short games in general have become, especially Call of Duty. Is it that hard to put in more missions? Or make Normal Mode harder, so it lasts longer? Veteran Mode took me a long time in each, but the games are still short on the first playthrough. What do other people think in this? I know most people buy it either mostly, or only for the multiplayer. I like the multiplayer, but I care more about the singleplayer.