Board Thread:Manga/@comment-5774380-20160408232143/@comment-5774380-20160504060128

It's because they are released on a weekly basis, and a regular season schedule spans around 25 weeks. It's the same for the American TV series, most of them have seasons of around 20-24 episodes; except some cases like the AMC and Netflix series which don't follow the typical season calendar; or the British series which commonly have [much] less than 10 episodes per season, but that's another issue.