Elizabeth Moon books in order
22 books in the catalogue, about 188 hours of reading in all; the shortest takes 5 hours and the longest 19 hours.
3 series and 14 standalone books in the catalogue.
Vatta's War
4 books 1 
Trading in Danger 5.4 h 3 
Engaging the Enemy 7.5 h
Trading in Danger 5.4 h 3 Engaging the Enemy 7.5 h 4 Command Decision length not known
5 Victory Conditions length not known
Serrano Legacy
5 books 1 Heris Serrano length not known
Once a Hero 7.3 h 
Change of Command 8.1 h 
Rules of Engagement 7.2 h 
Against the Odds 7.3 h Vatta's Peace
2 books
Standalone books
Divided Allegiance 9.6 h 
Sheepfarmer's Daughter 9.4 h 
Sassinak 6.1 h 
Generation Warriors 6.4 h 
The Deed of Paksenarrion 19.1 h 
The Planet Pirates 16.3 h 
Remnant Population 6.5 h 
The Speed of Dark 6.8 h 
Marque and Reprisal 7.3 h 
Victory Conditions 7.3 h 
Oath of Fealty 8.6 h 
Alien Contact 7.3 h 
Warrior Women 7.4 h 
Infinite Stars 9.9 h