Books like Heart of Thunder
Johanna Lindsey
Heart of Thunder is 359 pages, about 6 hours 35 minutes at 250 words a minute.
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Hostage Bride 6.4 h 
Lady of the Forest 14.0 h 
Lady of Desire 8.5 h 
The Mackenzies David 6.8 h 
Outlaw Hearts 8.0 h Bar height shows length. Estimated at 250 words a minute.