Ransom Riggs books in order
11 books in the catalogue, about 70 hours of reading in all; the shortest takes 1 hour and the longest 9 hours.
1 series and 7 standalone books in the catalogue.
Miss Peregrine
6 books 1 
Miss Peregrine's Home of Peculiar Children 7.1 h 2 
Hollow City 7.5 h 3 
Library of Souls 8.5 h 4 
A Map of Days 8.8 h
Miss Peregrine's Home of Peculiar Children 7.1 h 2 Hollow City 7.5 h 3 Library of Souls 8.5 h 4 A Map of Days 8.8 h 5 The Conference of the Birds length not known
6 The Desolations of Devil's Acre length not known
Standalone books
The Wonderful O 1.3 h 
Miss Peregrine's Home For Peculiar Children: The Graphic Novel 5.0 h 
Miss Peregrine's Journal for Peculiar Children 3.5 h 
Tales of the Peculiar 3.4 h 
As Desolacoes Do Recanto Do Demonio - Serie - O Lar Da Srta. Peregrine Para Crianças Peculiares - Vol. 6 8.8 h 
The Conference of the Birds 6.2 h 
The Desolations of Devil's Acre 9.4 h