Books like Be Prepared
Vera Brosgol
Be Prepared is 256 pages, about 4 hours 42 minutes at 250 words a minute.
6 books to read next
How long each takes
The Troop 6.8 h 
Steven Universe 2.1 h Logan Likes Mary Anne! (the Baby-Sitters Club Graphic Novel #8) 3.2 h 
The Baby-Sitters Club Graphix #1-4 Box Set 5.5 h 
Camp 4.1 h 
The Melancholy of Haruhi Suzumiya 4.3 h Bar height shows length. Estimated at 250 words a minute.