Books like The Unwanted Wedding
Barbara Cartland
The Unwanted Wedding is 171 pages, about 3 hours 8 minutes at 250 words a minute.
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Seeking Persephone 4.9 h 
How to Lose a Duke in Ten Days 9.0 h 
My Only Love 6.2 h 
Slightly Married 6.3 h 
The Lady's Proposal 6.8 h 
A Christmas Promise 4.7 h 
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.