This is a challenge to read books within certain ranges of page counts. Similar challenges to this didn't feel doable to me, so I decided to make one that capped out at 700 pages so I and hopefully others can actually complete it if they don't want to read longer books. 

For audiobooks, first check the print edition's page count. If the book exists exclusively in audio format, count 40 pages for every hour of the audiobook to calculate the page count.