Books like An Improper Proposal
Cheryl Bolen
An Improper Proposal is 319 pages, about 5 hours 51 minutes at 250 words a minute.
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How long each takes
Mistress of Mellyn 5.1 h 
To the Lighthouse 4.4 h 
The Governess of Highland Hall 8.9 h 
Longing 7.3 h 
Ethan 6.9 h 
Wedding Bells for Beatrice 4.0 h 
The Devil's Pool 3.4 h 
Valtieri's Bride 5.0 h Only Beloved 7.3 h 
The Preacher's Wife 5.2 h Bar height shows length. Estimated at 250 words a minute.