Books like Beelzebub's Tales to His Grandson
G. I. Gurdjieff, A. Orage, Jeanne de Salzmann, Henri Tracol
Beelzebub's Tales to His Grandson is 1,156 pages, about 21 hours 12 minutes at 250 words a minute.
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The Tao of Physics 6.5 h 
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Two Alone 5.2 h Bar height shows length. Estimated at 250 words a minute.