I'm currently writing an article where I review each book from a book series. The book series contained 25 books all together. They weren't thick books by any means, two of the books were directly connected to one another, and another two may have been connected to each other (that was never really explained).
I wouldn't do a long review of each book, just a paragraph or few to give you my basic feeling towards each book. Would that sound like a too long of an article for you?