Persona 3 Reload: main story about 63.5 hours; story with some extras about 84.2 hours; 100% completion about 130 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 Persona 3 Reload yet.
Game Tales keeps what happened between you and a game in one Tale you can keep building.
Start your Persona 3 Reload Tale.