Books like Molly Moon Stops the World
Georgia Byng, Isabel Gonzalez-Gallarza
Molly Moon Stops the World is 346 pages, about 6 hours 21 minutes at 250 words a minute.
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How long each takes
Gathering Blue 4.0 h 
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Samantha Learns a Lesson 1.1 h 
Samantha's Surprise 1.2 h 
Samantha Saves the Day 1.2 h Bar height shows length. Estimated at 250 words a minute.