Books like The Mortal Instruments 6
Cassandra Clare
The Mortal Instruments 6 is 638 pages, about 11 hours 42 minutes at 250 words a minute.
9 books to read next
How long each takes
Damián 8.7 h 
Fallen 8.3 h 
Dark Witch 7.2 h 
A Dowry of Blood 5.0 h 
Winter's Tale 12.3 h 
The Twilight Saga Collection 44.9 h 
Nature of the Beast 6.0 h 
Bespelling Jane Austen 7.0 h 
Trylle The Complete Trilogy 16.7 h Bar height shows length. Estimated at 250 words a minute.