Warframe: main story about 31.8 hours; story with some extras about 847 hours; 100% completion about 1,792 hours. These are IGDB player-submitted averages from 11 submissions, not a deadline or a prediction of your pace.
Source: IGDB player submissions
Community playtime data is not available for Warframe yet. Tracked platforms include PlayStation.
Game Tales keeps what happened between you and a game in one Tale you can keep building.