Books like Generation Warriors
Anne McCaffrey, Elizabeth Moon
Generation Warriors is 349 pages, about 6 hours 24 minutes at 250 words a minute.
8 books to read next
How long each takes
Star Wars - I, Jedi 8.5 h 
Revenger 7.8 h On Stranger Tides 7.1 h 
Lucky Starr and the Pirates of the Asteroids 3.2 h 
Space Viking 3.9 h Clockwork Angels 5.4 h 
The Truth of Valor 6.0 h 
The Life of the World to Come 6.1 h Bar height shows length. Estimated at 250 words a minute.