Books like The First Mountain Man
William W. Johnstone
The First Mountain Man is 320 pages, about 5 hours 52 minutes at 250 words a minute.
10 books to read next
How long each takes
The Indifferent Stars Above 6.2 h 
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The Tall Stranger 2.3 h 
The Way West 6.2 h 
Warrior's Heart 8.1 h 
Dear America 3.0 h 
History of the Donner Party 4.7 h 
Hanging Woman Creek and Lando 9.6 h 
Destry Rides Again 4.7 h 
Big Medicine 5.0 h Bar height shows length. Estimated at 250 words a minute.