Books like Misty of Chincoteague
Marguerite Henry
Misty of Chincoteague is 173 pages, about 3 hours 10 minutes at 250 words a minute.
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How long each takes
The Mud Pony 35 min 
Dinosaurs Before Dark 1.5 h 
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The Ersatz Elevator 4.8 h 
Over Sea, Under Stone 4.6 h 
Homecoming 5.8 h 
A Summer to Die 2.8 h 
Ish 35 min 
Jacob Have I Loved 4.0 h 
Judy Moody, M.D 2.9 h 
Becoming Naomi León 4.5 h Bar height shows length. Estimated at 250 words a minute.