Books like Sharpe's Havoc
Bernard Cornwell
Sharpe's Havoc is 384 pages, about 7 hours 2 minutes at 250 words a minute.
12 books to read next
How long each takes
Rifleman Dodd 3.5 h 
Mr. Midshipman Hornblower 4.7 h 
A Ship of the Line 5.9 h 
Hornblower And The Atropos 5.9 h 
Lord Hornblower 4.5 h 
Beat to Quarters 5.9 h 
Commodore Hornblower 5.8 h 
Hornblower and the "Hotspur" 6.3 h 
King Rat 7.2 h 
The Gun 3.5 h 
Still Life 8.4 h Men at War 9.3 h Bar height shows length. Estimated at 250 words a minute.