The main story of Call of Duty: Modern Warfare 3 lasts around five hours, according to HowLongToBeat. However, you have to be solely focused on the story or just really good to beat it in that time. If you go for some of the achievements as well, then it will take around seven hours.
It is simple to play split screen Modern Warfare PS4/Xbox One with your friends. All things you need to do is to make sure that you get 2 controllers paired up and follow the steps below to operate: Step 1. Connect the second controller to your PS4/Xbox One system.