Books like Catherine the Great
Henri Troyat
Catherine the Great is 400 pages, about 7 hours 20 minutes at 250 words a minute.
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How long each takes
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Queen Victoria 5.2 h 
The Sun King 4.7 h 
Geronimo's Story of His Life 4.0 h 
Mary Tudor 8.3 h 
Majesty 7.0 h 
Lady of the English 9.8 h Bar height shows length. Estimated at 250 words a minute.