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!
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
Not very long; probably under a minute.
it took them roughly about 6 months :)
exactly 1.23956364647901225 days
Depends on your connection speed.
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...