Hellblade: Senua's Sacrifice: main story about 5.5 hours; story with some extras about 7.9 hours; 100% completion about 10.4 hours. These are IGDB player-submitted averages from 16 submissions, not a deadline or a prediction of your pace.
Source: IGDB player submissions
Community playtime data is not available for Hellblade: Senua's Sacrifice yet.
Game Tales keeps what happened between you and a game in one Tale you can keep building.
Start your Hellblade: Senua's Sacrifice Tale.