Five hours is fairly short for such a game, but I've seen reviews of action and FPS games that mention 5 to 10 hour play times. RPG games tend to be longer, though I finished one (Gorasul) in under 15 hours. Generally, I would call an RPG short at 20 hours, with average being on the order of 40 hours or more. DD should take from about 40-50 hours (for the main plot) to 100 hours (doing everything).
