Books like Stormy, Misty's Foal
Marguerite Henry, M. Henry, Marguerute Henry and Welsey Dennis
Stormy, Misty's Foal is 224 pages, about 4 hours 6 minutes at 250 words a minute.
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How long each takes
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Fritz and the Beautiful Horses 34 min 
After the Storm 3.2 h 
Pony in the Porch 2.8 h 
The Mud Pony 35 min 
Every New Day 2.7 h 
Tomorrow's Promise 3.1 h 
Stardust and the Daredevil Ponies 4.6 h 
A Touch of Magic 2.9 h Bar height shows length. Estimated at 250 words a minute.