Books like Ecstasy's Promise
Constance O'Banyon
Ecstasy's Promise is 574 pages, about 10 hours 31 minutes at 250 words a minute.
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How long each takes
Savage Wonder 7.3 h Promise Me Spring 8.2 h 
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Bartered Bride 5.4 h 
Between The Thunder 5.5 h 
Windswept Passion 7.9 h 
Passion's Deep Spell 7.0 h 
Sweet Savage Love 11.7 h 
Hawke's Pride 8.2 h 
Devil on Horseback 3.4 h 
Silken Savage 8.7 h 
Caress and Conquer 8.8 h Bar height shows length. Estimated at 250 words a minute.