Books like Witches' Key to Terror
Silver Ravenwolf
Witches' Key to Terror is 264 pages, about 4 hours 50 minutes at 250 words a minute.
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Witchlight 4.3 h 
Dark Magick 3.5 h 
Heckedy Peg 35 min 
Wednesday Witch 2.4 h 
Spellbound 3.5 h Bar height shows length. Estimated at 250 words a minute.