Books like The Mystery of the Pirate Ship
Gerónimo Stilton
The Mystery of the Pirate Ship is 50 pages, about 55 minutes at 250 words a minute.
9 books to read next
How long each takes
Redwall 6.5 h 
The Girl from Everywhere 8.8 h 
Mariel of Redwall 7.1 h 
The Witches--The Graphic Novel 5.6 h 
Cleopatra in Space 3.6 h 
Mouse Guard Fall 1152 3.6 h 
A Trip to the Bottom of the World with Mouse 40 min 
Teen Titans 2.6 h 
Babymouse 1.8 h Bar height shows length. Estimated at 250 words a minute.