You need to create a room and then invite your friends to the game any way you like. Your friends get the invitation with the number of the room. They should enter this number in the game and you are ready to start playing.
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When focusing on the main objectives, Call of Duty: Modern Warfare 2 is about 6 Hours in length. If you're a gamer that strives to see all aspects of the game, you are likely to spend around 31 Hours to obtain 100% completion.
'Modern Warfare 3' campaign length\n\n We found that Modern Warfare 3's campaign could be completed in three to six hours. The shorter of these playtimes is based on the easier and normal difficulties in MW3, and assumes that you are just ticking off objectives without too much exploring in its open combat missions.