Veronica Roth books in order
8 books in the catalogue, about 97 hours of reading in all; the shortest takes 5 hours and the longest 38 hours.
1 series and 4 standalone books in the catalogue.
Divergent
4 books 1 
Divergent 8.9 h 2 
Insurgent 9.6 h 3 
Allegiant 9.5 h
Divergent 8.9 h 2 Insurgent 9.6 h 3 Allegiant 9.5 h Four: A Divergent Story Collection length not known
Standalone books
Collected editions
Volumes that gather several of the books above.
