Jack Whyte books in order
4 books in the catalogue, about 42 hours of reading in all; the shortest takes 9 hours and the longest 12 hours.
1 series in the catalogue.
A Dream of Eagles
10 books 1 
The Skystone 11.6 h 2 The Singing Sword 11.2 h 
The Saxon Shore 11.6 h 5.1 
The Fort at River's Bend 8.8 h 
Clothar the Frank 9.7 h
The Skystone 11.6 h 2 The Singing Sword 11.2 h 3 The Eagles' Brood length not known
4 The Saxon Shore 11.6 h 5.1 The Fort at River's Bend 8.8 h 5.2 Metamorphosis length not known
6.1 Clothar the Frank 9.7 h 6.2 The Eagle length not known
Clothar the Frank (part II) length not known
The Eagle (part II) length not known