Halo 5: Guardians: main story about 6 hours; story with some extras about 10.4 hours; 100% completion about 65 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 Halo 5: Guardians yet. Tracked platforms include Xbox.
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