Books like The Holiness of God
R. C. Sproul
The Holiness of God is 230 pages, about 4 hours 13 minutes at 250 words a minute.
12 books to read next
How long each takes
The Pursuit of God 1.7 h 
Knowing God 4.7 h 
The Ragamuffin Gospel 4.2 h 
Disappointment with God 6.0 h 
The Knowledge of the Holy 2.8 h 
Experiencing God 5.3 h 
The Way of Perfection 5.0 h 
The Father Heart of God 2.8 h 
Waiting for God 3.5 h 
Hearing God 4.2 h 
The God Code 5.3 h 
The Case for God 7.7 h Bar height shows length. Estimated at 250 words a minute.