Books like The Mystery of Alligator Swamp
Gertrude Chandler Warner
The Mystery of Alligator Swamp is 128 pages, about 2 hours 21 minutes at 250 words a minute.
12 books to read next
How long each takes
Locomotion 1.8 h 
Vespers Rising 4.1 h 
The Willoughbys 3.2 h 
Rainbow Valley 4.4 h 
The Door to Time 4.2 h 
Then There Were Five 4.4 h 
The Singing 8.9 h 
Superfudge 3.1 h 
The Bad Beginning 3.2 h 
Dark Places 6.8 h 
Kristy's Big Day (The Baby-Sitters Club #6) 2.8 h 
The Bell Bandit 3.2 h Bar height shows length. Estimated at 250 words a minute.