Suzanne Collins books in order
12 books in the catalogue, about 124 hours of reading in all; the shortest takes 6 hours and the longest 33 hours.
2 series and 7 standalone books in the catalogue.
The Hunger Games
5 books 1 
The Hunger Games 7.3 h 2 
Catching Fire 7.3 h 3 
Mockingjay 7.8 h
The Hunger Games 7.3 h 2 Catching Fire 7.3 h 3 Mockingjay 7.8 h 4 The Ballad of Songbirds and Snakes length not known
5 Sunrise on the Reaping length not known
The Underland Chronicles
5 books 1 Gregor the Overlander length not known
2 Gregor and the Prophecy of Bane length not known
3 
Gregor and the Curse of the Warmbloods 6.6 h 4 Gregor and the Marks of Secret length not known
5 Gregor and the Code of Claw length not known
Standalone books
Collected editions
Volumes that gather several of the books above.
