Books like The Jewels of Aptor
Samuel R. Delany
The Jewels of Aptor is 162 pages, about 2 hours 58 minutes at 250 words a minute.
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King and Maxwell 7.7 h 
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Religious Hostility 2.9 h 
Whirlwind, Volume One 21.0 h 
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A Bruxa de Monte Córdova 4.4 h Bar height shows length. Estimated at 250 words a minute.