User blog comment:B214/Season 3 confirmed!!!!!!/@comment-25072311-20140617021856/@comment-1359322-20140617025010

You may think it's long but when converted into a weekly series it would end up being very short. One year and the anime would easily catch up to Volume 15 or more. Note when Season 2 aired, the Novels haven't even reached Volume 16. Season 1 & 2 had an interval of 14 months and only 5 Volumes were produced in that time period. And anime should it be on a weekly terms won't have to do that much consideration like 1 or 2-cour series has so, they can actually cover more than 5 volumes in 14 months.