Books like When Darkness Falls
Mercedes Lackey, James Mallory
When Darkness Falls is 496 pages, about 9 hours 6 minutes at 250 words a minute.
12 books to read next
How long each takes
The Elfstones of Shannara 11.2 h 
Homeland 6.0 h 
The Sword of Shannara 13.3 h 
The Eye of the World 14.4 h 
The Elvenbane 7.6 h 
The Silent Blade 7.0 h 
The Crystal Shard 6.3 h 
The Scions of Shannara 9.3 h 
Test of the Twins 7.3 h 
Ascendance 7.3 h 
The Elf Queen of Shannara 7.4 h 
The Gypsy Morph 7.4 h Bar height shows length. Estimated at 250 words a minute.