My votes were just educated guesses, but ya, given that I play my main game at the moment (Dota 2) twoish hours on weekdays and a couple hours on the weekend, I'm guessing between 10-20 hours a week. Even though they're advertising 400+ hours of gameplay, I can't imagine I'll do every last thing, especially if there are factions involved (I will probably do 2 playthroughs to see most options, but I'm not going to go overboard just to see every last bit of gameplay). I'm guessing it will hold my attention till Christmas or so, at which point I'll probably pick up one of the games I missed (Just Cause 3, Battlefront, and Hitman will all be out by then). Shame I can't get excited for Halo anymore...