Sabaa Tahir books in order
7 books in the catalogue, about 64 hours of reading in all; the shortest takes 7 hours and the longest 12 hours.
1 series and 5 standalone books in the catalogue.
An Ember in the Ashes
4 books 1 
An Ember in the Ashes 8.5 h 
A Reaper at the Gates 8.8 h
An Ember in the Ashes 8.5 h 2 A Torch Against the Night length not known
3 A Reaper at the Gates 8.8 h 4 A Sky Beyond the Storm length not known
Standalone books
Collected editions
Volumes that gather several of the books above.
