Books like The Reluctant Bride
Barbara Cartland
The Reluctant Bride is 224 pages, about 4 hours 6 minutes at 250 words a minute.
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Second Best 3.5 h 
The Property of a Gentleman 5.3 h 
Duchess for a Day 5.9 h 
Heiress in Regency Society 10.6 h Bar height shows length. Estimated at 250 words a minute.