Books like The Histories
Polybius, Evelyn S. Shuckburgh
The Histories is 519 pages, about 9 hours 31 minutes at 250 words a minute.
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How long each takes
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Alexander the Great 6.5 h 
History of Animals 6.0 h 
Egypt, Greece, and Rome 12.0 h Bar height shows length. Estimated at 250 words a minute.