Books like Irrational Man
William Barrett
Irrational Man is 278 pages, about 5 hours 6 minutes at 250 words a minute.
6 books to read next
How long each takes
Being and Nothingness 13.1 h 
Existentialism and Human Emotions 1.7 h 
The Doctor and the Soul 5.3 h 
L' Existentialisme Est Un Humanisme 2.6 h 
Existentialism from Dostoevsky to Sartre 5.9 h 
The Transcendence of the Ego 2.3 h Bar height shows length. Estimated at 250 words a minute.