Karen Traviss books in order
20 books in the catalogue, about 151 hours of reading in all; the shortest takes 5 hours and the longest 9 hours.
4 series and 10 standalone books in the catalogue.
Republic Commando
4 books 1 
Republic Commando: Hard Contact 5.6 h 
Republic Commando: True Colors 9.1 h
Republic Commando: Hard Contact 5.6 h 2 Republic Commando: Triple Zero length not known
3 Republic Commando: True Colors 9.1 h 4 Republic Commando: Order 66 length not known
Gears of War
5 books 1 
Gears of War: Aspho Fields 7.1 h 2 
Gears of War: Jacinto's Remnant 7.3 h 
Gears of War: The Slab 9.1 h
Gears of War: Aspho Fields 7.1 h 2 Gears of War: Jacinto's Remnant 7.3 h 3 Gears of War: Anvil Gate length not known
4 Gears of War: Coalition's End length not known
5 Gears of War: The Slab 9.1 h Wess'Har
6 books 1 City of Pearl length not known
2 
Crossing the Line 6.8 h 3 The World Before length not known
4 
Matriarch 7.3 h 5 
Ally 7.3 h 6 
Judge 7.3 h The Clone Wars
3 books
Standalone books
Star Wars - Legacy of the Force - Bloodlines 7.0 h 
Star Wars - Republic Commando - Triple Zero 8.2 h 
Star Wars - Legacy of the Force - Sacrifice 8.2 h 
Star Wars - Legacy of the Force - Revelation 8.2 h 
Star Wars - Order 66 - A Republic Commando Novel 8.8 h 
Star Wars - The Clone Wars 4.7 h 
Star Wars - 501St - An Imperial Commando Novel 8.5 h 
Halo 8.4 h 
Halo Kilo-Five Trilogy 8.1 h 
Halo: Mortal Dictata 9.1 h