Board Thread:Questions and Answers/@comment-80.132.99.68-20150329114408/@comment-918376-20150930115141

Yup. Inferring that he releases two volumes every year (that's not always the case, he's had times where he only releases one volume in a year), it'll take him three years to finish publishing the novels. Volume 10, which the anime ended with, was just published in Japan today. We won't be seeing Volume 11 published for a while, and then factor in the amount of time it takes to produce the anime, and the earliest that most English and Japanese fans are thinking it'll come is 2019.

(That is, of course, inferring that we will get a Season 3.)