Olivie Blake books in order
4 books in the catalogue, about 31 hours of reading in all; the shortest takes 7 hours and the longest 9 hours.
1 series and 1 standalone book in the catalogue.
The Atlas
4 books Sacred Hospitality length not known
The Atlas Six 7.3 h 
The Atlas Paradox 7.9 h 
The Atlas Complex 9.0 h 