Books like A Call to Arms
David Weber, Timothy Zahn, Thomas Pope
A Call to Arms is 427 pages, about 7 hours 50 minutes at 250 words a minute.
12 books to read next
How long each takes
A Call to Duty 7.3 h 
Scattered Suns 13.5 h 
Cibola Burn 11.1 h 
Halo Cryptum 6.5 h 
Halo 7.0 h 
The Last Colony 5.9 h 
Silentium 6.1 h 
Hellhole 9.7 h 
Tilting the Balance 9.1 h 
The Cole Protocol 6.8 h 
Star Wars 7.0 h 
Captain Vorpatril's Alliance 7.9 h Bar height shows length. Estimated at 250 words a minute.