Call of Duty: main story about 9.8 hours; story with some extras about 12.7 hours; 100% completion about 22.8 hours. These are IGDB player-submitted averages from 6 submissions, not a deadline or a prediction of your pace.
Source: IGDB player submissions
Community playtime data is not available for Call of Duty yet.
Game Tales keeps what happened between you and a game in one Tale you can keep building.