Books like Baby-Sitters Beware
Ann M. Martin
Baby-Sitters Beware is 230 pages, about 4 hours 13 minutes at 250 words a minute.
7 books to read next
How long each takes
Fifteen 3.6 h 
The Baby-Sitters Club Guide to Baby-sitting 2.4 h 
Jennifer the Babysitter Fairy 3.1 h 
The Babysitting Wars 3.0 h 
Navaeh Seadooll 2.7 h 
Stolen Children 3.0 h 
Arthur's Mystery Babysitter 26 min Bar height shows length. Estimated at 250 words a minute.