not a guess, but a fact, just serched about it, at first i just read it on some forum but now it is real, just search like how many hours of gameplay there are. there are a bunch of websites saying it has been confirmed there are at LEAST 150 hours of gampelay

http://www.totalvideogames.com/pages...rticle_id=6063

so, i highly doubt you will finish lol, sry to tell you