Books like Lady Sarah's Sinful Desires
Sophie Barnes
Lady Sarah's Sinful Desires is 360 pages, about 6 hours 36 minutes at 250 words a minute.
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How long each takes
The Temporary Wife / A Promise of Spring Ok 9.7 h 
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Loyalties 3.5 h 
The Duke Is Mine 7.0 h Bar height shows length. Estimated at 250 words a minute.