Books like A Discovery of Witches
Deborah Harkness
A Discovery of Witches is 720 pages, about 13 hours 12 minutes at 250 words a minute.
12 books to read next
How long each takes
Harry Potter and the Philosopher's Stone 5.6 h 
Of Blood and Bone 9.4 h 
Pale Demon 8.1 h 
Black Magic Sanction 9.1 h 
The Romance of the Rose 7.0 h 
Belong to the Night 6.1 h 
Dark Lover 8.2 h 
Face the Fire 7.3 h 
Dark Prince 6.5 h 
Blood Magick 6.3 h 
Blackwood Farm 11.6 h 
Dark Magic 6.6 h Bar height shows length. Estimated at 250 words a minute.