Which Cod has the longest campaign?

Which Cod has the longest campaign? Black Ops III is the longest game in the Call of Duty series by all accounts. Most people report finishing the main story in about nine hours, which is certainly a respectable amount of time for a first-person shooter.

Black Ops III is the longest game in the Call of Duty series by all accounts. Most people report finishing the main story in about nine hours, which is certainly a respectable amount of time for a first-person shooter.
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