Single-Player
Polled
Average
Main Story
503
6h 45m
Main + Extras
80
9h 22m
Completionist
74
9h 41m
All PlayStyles
657
7h 24m
Typically, we'd expect a Call of Duty campaign to last around 7 hours. They've never been lengthy titles. The longest according to players on HowLongToBeat is Black Ops 3, the campaign of which should take players around 9 hours to finish.