Nancy Krulik books in order
10 books in the catalogue, about 16 hours of reading in all; the shortest takes 18 minutes and the longest 3 hours.
10 standalone books in the catalogue.
Standalone books
Hello Out There 18 min 
Butterfly and the Bog Beast 35 min 
The Magic School Bus Going Batty 35 min 
The Magic School Bus In A Pickle 1.2 h 
The Case of the Ballet Bandit 1.6 h 
The Witch That Launched a Thousand Ships 2.8 h 
What a Doll! 2.9 h 
Madame President 1.9 h 
Cheat Sheet 1.9 h 
P.S. I Really Like You 2.0 h