Blue Fire: main story about 8.7 hours; story with some extras about 10.3 hours; 100% completion about 12.5 hours. These are IGDB player-submitted averages from 3 submissions, not a deadline or a prediction of your pace.
Source: IGDB player submissions
Community playtime data is not available for Blue Fire yet.
Game Tales keeps what happened between you and a game in one Tale you can keep building.