Are lessons longer now?

I just imported an ebook and lessons are much longer than they used to be. Did I somehow do it, is there any setting for that? Or is it a bug? Or is it a new future?

At first I thought the book is incomplete (only 20 lessons, while it is ussually more than 50 or 60)


Yes, the limit has been raised to 6000 words like @SeoulMate wrote here: Single chapter import!