Books like Dear Sister
Kate William
Dear Sister is 150 pages, about 2 hours 45 minutes at 250 words a minute.
6 books to read next
How long each takes
To All the Boys I've Loved Before 6.8 h 
Ghostgirl 5.6 h 
Always and Forever, Lara Jean 6.1 h 
The Wicked Deep 5.8 h 
This Raging Light 5.3 h 
Die for Me 6.2 h Bar height shows length. Estimated at 250 words a minute.