VGC writes: “The campaign was released on Thursday for players whod pre-ordered the digital edition of the game, giving them access to the single-player portion a week ahead of the full release.
But now, following that release, players have reported that the campaign is clocking in at around 3 to 4 hours in length.”
Source: N4G PC Modern Warfare 3 campaign can be finished in 3-4 hours, its claimed