Books like Desperate Duchesses
Eloisa James
Desperate Duchesses is 400 pages, about 7 hours 20 minutes at 250 words a minute.
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Jamaica Inn 5.6 h 
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The Unknown Ajax 6.5 h 
Married by Morning 6.5 h 
Seducing an Angel 7.0 h 
Remembrance 8.9 h Bar height shows length. Estimated at 250 words a minute.