Books like Sharpe's Gold
Bernard Cornwell, Frederick Davidson
Sharpe's Gold is 256 pages, about 4 hours 42 minutes at 250 words a minute.
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How long each takes
The Fields of Death 11.2 h 
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In Danger's Path 10.1 h 
Behind the Lines 10.3 h 
The Exploits of Brigadier Gerard 4.3 h 
The Gun 3.5 h 
The Song of Achilles 7.1 h 
Call to Arms 6.5 h 
Blood and Honor 11.1 h 
Under Fire 13.3 h Bar height shows length. Estimated at 250 words a minute.