Books like Tusculan Disputations
Cicero
Tusculan Disputations is 438 pages, about 8 hours 2 minutes at 250 words a minute.
12 books to read next
How long each takes
Meditations 3.7 h 
Leviathan 9.3 h 
The Muqaddimah, an Introduction to History 9.3 h 
Gorgias 3.7 h 
The Arthashastra 8.9 h 
Common Sense 1.1 h 
The New Atlantis 1.1 h 
The City of God 8.0 h 
Protagoras 2.7 h 
Hegel's Philosophy of Right 7.0 h 
The Social Contract 4.6 h 
Timaeus 5.1 h Bar height shows length. Estimated at 250 words a minute.