User blog comment:Otaku Chick/Otabear's Anime Review: Ep 142/@comment-4829046-20120809121400/@comment-2214433-20120809145513

No, there was an interview with the author, he said it'd last for more than 1.5 years, with two more arcs. Actually, I haven't read that info about two arcs myself, I got that from a friend, but 1.5+ years should be confirmed. So my bet is 2 years.