Books like Witch's Business
Diana Wynne Jones
Witch's Business is 185 pages, about 3 hours 24 minutes at 250 words a minute.
12 books to read next
How long each takes
The Magic Bed-Knob 3.5 h 
Half Wild 7.0 h 
Dark Magick 3.5 h 
Hex Hall 5.9 h 
Spellbound 3.5 h 
Juniper 3.6 h 
The Worst Witch Strikes Again 1.7 h 
After Candlemas 2.2 h 
Sweep, Volume I 7.7 h 
Shamrock Shenanigans 2.9 h 
All You Need Is a Love Spell 3.0 h 
Witch's Pyre 7.0 h Bar height shows length. Estimated at 250 words a minute.