Books like Sixth Grade Secrets
Louis Sachar
Sixth Grade Secrets is 201 pages, about 3 hours 41 minutes at 250 words a minute.
12 books to read next
How long each takes
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Freckle Juice 50 min 
Awkward 3.9 h 
The Last Straw 4.0 h 
Miss Nelson Is Missing! 35 min 
Crush 4.3 h 
Spy School 5.3 h 
Schooled 3.8 h Bar height shows length. Estimated at 250 words a minute.