Books like Phoenix and Ashes
Mercedes Lackey
Phoenix and Ashes is 443 pages, about 8 hours 7 minutes at 250 words a minute.
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Wyrd Sisters 5.9 h 
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Witches Abroad 5.9 h 
Brood of the Witch-Queen 3.8 h 
Maskerade 6.6 h 
Her Soul for Revenge 10.9 h 
Blood Canticle 7.5 h 
Season of Storms 7.7 h Bar height shows length. Estimated at 250 words a minute.