Books like Waldo and Magic, Inc
Robert A. Heinlein
Waldo and Magic, Inc is 204 pages, about 3 hours 44 minutes at 250 words a minute.
12 books to read next
How long each takes
Gentleman Jole and the Red Queen 6.5 h 
Defender 7.1 h 
Ancillary Sword 7.6 h 
Downbelow Station 7.9 h 
Cibola Burn 11.1 h 
Silentium 6.1 h 
A Rising Thunder 10.2 h 
Captain Vorpatril's Alliance 7.9 h 
The Earthsea Quartet 12.9 h 
Three Hearts and Three Lions 3.3 h 
Armada 7.0 h 
The Illustrated Man 4.6 h Bar height shows length. Estimated at 250 words a minute.