When it comes to writing a book review, the length of the post will depend on a few factors. The most important one is the number of reviews that the blogger wants to write for the day. If they are only writing one or two reviews, then a shorter post will work just fine. However, if they are wanting to write multiple reviews, then a longer post will be necessary in order to provide all the necessary information.
Additionally, the tone of the review will also play a role in how long it should be. If the blogger is reviewing a humorous book, then they may want to keep their post short and sweet. However, if they are reviewing a more serious book, then they may want to provide more detail and analysis. Ultimately, it is up to the blogger to decide what length their book review post should be.