Books like Cauldron Of Ghosts
David Weber, Eric Flint
Cauldron Of Ghosts is 720 pages, about 13 hours 12 minutes at 250 words a minute.
12 books to read next
How long each takes
Eastern Standard Tribe 4.1 h 
The Camel Club 8.0 h 
And the Truth Shall Set You Free 9.5 h 
The Third Twin 9.2 h 
The Collectors 9.1 h 
Take the Key and Lock Her Up 6.2 h 
Neuromancer 5.8 h 
Unseen 8.1 h 
Leviathan Wakes 10.9 h 
A Dangerous Engagement 5.3 h 
The Forbidden Door 8.8 h 
Artemis 5.9 h Bar height shows length. Estimated at 250 words a minute.