Books like Justin Morgan Had a Horse
Marguerite Henry
Justin Morgan Had a Horse is 172 pages, about 3 hours 9 minutes at 250 words a minute.
12 books to read next
How long each takes
Mr. Popper's Penguins 2.5 h 
Banner in the Sky 4.7 h 
Smoky, the Cow Horse 5.7 h 
Thistle and Thyme 4.0 h 
The Mud Pony 35 min 
The Great Fire 2.6 h 
Annie and the Old One 48 min 
Maniac Magee 3.4 h 
Robin Hood 4.7 h 
Bambi 3.8 h 
The Journey to the West 10.4 h 
The Sword in the Stone 5.3 h Bar height shows length. Estimated at 250 words a minute.