Board Thread:Questions and Answers/@comment-17738315-20140721162154/@comment-6697950-20140721171214

The first three arcs are 2 volumes long each (around 11-14 episodes when converted to anime). Alicization is currently 6 (soon to be 7) volumes in and only slightly more than half done. The first half of Alicization alone would likely be enough for a season of its own.