It tries to hit chapter boundaries, but it depends on the amount of content. If you have 30 days to read 33 chapters there is no even division, or 30 days and 20 chapters (etc). Also, forcing chapter boundaries can lead to uneven reading times, so it will move to paragraph boundaries if it can. It all depends on the amount of reading material there is. The more daily material there is to read the more likely it will divide by chapters.Would it be better to end a day's reading on chapter boundaries. I read the whole chapter regardless of what the schedule says because I have the context in mind. The time element is not so important to me and it doesn't add much time to finish the chapter.