That depends on your skill level and how long you play.
Getting to level 55 doesn't take that long. If your good, it should be a breeze.
Stay calm and take it slow
7 days if you can play good!
Not very long; probably under a minute.
you have to fight a boss that you can only kill with the wonder waff or flamethrower but take an extreamly long time to kill
Depends on your connection speed.
exactly 1.23956364647901225 days
it took them roughly about 6 months :)
To defuse or plant a bomb in Call of Duty Ghosts, it will take 5.5 seconds.
48 hours
I would say it will take about 2-3 hours for campaign.
Call of Duty 1 Call of Duty The big red one Call of Duty 2 Call of Duty 3 Call of Duty 4 : Modern Warfare Call of Duty : World at War Call of Duty : Modern Warfare 2 Call of Duty : Blackops Call of Duty : Modern Warfare 3 9 Call of Duties all together, 6 if you take out the modern warfares...