Mortimer J. Adler books in order
12 books in the catalogue, about 94 hours of reading in all; the shortest takes 2 hours and the longest 25 hours.
12 standalone books in the catalogue.
Standalone books
How to Read a Book 7.3 h 
The Great Ideas 17.6 h The Great Ideas, Volume 2 24.7 h 
Foundations of Science and Mathematics 4.3 h 
Great Ideas from the Great Books 4.8 h 
Aristotle for Everybody 3.8 h 
The PAIDEIA PROPOSAL 1.5 h 
How to Speak, How to Listen 5.1 h 
Ten Philosophical Mistakes 3.7 h 
A Guidebook to Learning 3.0 h 
Great Books of the Western World 8.9 h 
How to Think About the Great Ideas 9.7 h