User blog comment:DarknessLord32/How long until the end?/@comment-38765282-20190314123535/@comment-1327106-20190314225129

For future reference, this is a question better asked on the forums rather than a blog post. Blogs are generally essays to discuss a particular topic, not a quick Q&A. It's where you present your argument and other people discuss whether or not they agree.

That's the most likely reason you didn't get an answer. If you'd asked on the Forums or the Discussion section you probably would have gotten a reply.

That said, we are currently on Chapter 115 and we are in the final story arc, so we are likely to end on Chapter 122. Isayama usually goes no go longer than 4 volumes a story arc, and each volume has 4 chapters, so there are only certain numbers he can end on without ending up with a weirdly sized book (which his publisher probably will discourage him from doing).

If the current arc is 3 volumes we'll end on 118, but I don't think we're that close to the end. If he goes for an unprecedented 5 volumes it will end on chapter 126.

So, Chapters 118, 122, and 126 are your likeliest bets.