Books like Julian Is a Mermaid
Jessica Love, Avi Roque, Georgina Lázaro
Julian Is a Mermaid is 39 pages, about 43 minutes at 250 words a minute.
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How long each takes
Pink Is for Boys 44 min 
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Leonardo, the Terrible Monster 53 min 
This Day in June 44 min 
Rumple Buttercup 2.5 h 
Marisol McDonald Doesn't Match 34 min 
The Mermaid's Mirror 5.9 h Bar height shows length. Estimated at 250 words a minute.