Books like The Gates of Sleep
Mercedes Lackey, Kayla Fell
The Gates of Sleep is 389 pages, about 7 hours 8 minutes at 250 words a minute.
12 books to read next
How long each takes
Black Sun 8.5 h 
A Conjuring of Light 12.5 h 
A Marvellous Light 7.0 h 
Sorcerer to the Crown 7.0 h 
The Way of Wyrd 3.8 h 
Shadow of Night 10.9 h 
Circe 7.4 h 
Mistborn 31.4 h 
The Time of Contempt 6.1 h 
The Wise Man’s Fear 18.5 h 
New Spring 6.2 h 
The Once and Future Witches 9.7 h Bar height shows length. Estimated at 250 words a minute.