Books like The Fallible Fiend
L. Sprague De Camp
The Fallible Fiend is 176 pages, about 3 hours 14 minutes at 250 words a minute.
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Breakfast of Champions 5.5 h 
The First Men in the Moon 4.4 h 
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Galápagos 5.4 h 
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Jem 5.7 h Bar height shows length. Estimated at 250 words a minute.