Books like The Mystery of the Winged Lion
Carolyn Keene
The Mystery of the Winged Lion is 206 pages, about 3 hours 47 minutes at 250 words a minute.
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How long each takes
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The Phantom of Nantucket 3.5 h 
The Ocean of Osyria 1.8 h 
The Deadliest Stunt 2.1 h 
Global Warning 2.1 h Bar height shows length. Estimated at 250 words a minute.