Books like The Long Earth
Terry Pratchett, Stephen Baxter
The Long Earth is 400 pages, about 7 hours 20 minutes at 250 words a minute.
12 books to read next
How long each takes
Pebble in the Sky 4.1 h 
The Montauk Project 2.9 h 
Dragon's Time 8.2 h 
A Wrinkle In Time Trilogy 12.1 h 
Sea of Tranquility 5.0 h 
Time's Eye a Time Odyssey 7.0 h 
The Defiant Agents 3.6 h 
The Map of Time 12.0 h 
Before the Coffee Gets Cold 4.4 h 
The Invisible Man 3.1 h 
Rick and Morty 2.3 h 
Brasyl 6.6 h Bar height shows length. Estimated at 250 words a minute.