Books like Practical Cryptography
Niels Ferguson
Practical Cryptography is 410 pages, about 7 hours 31 minutes at 250 words a minute.
6 books to read next
How long each takes
Cryptonomicon 16.8 h 
Applied Cryptography 14.4 h 
Crypto 6.5 h 
The Pattern on the Stone 3.1 h 
Cryptography for Dummies 5.9 h 
Understanding Cryptography 6.8 h Bar height shows length. Estimated at 250 words a minute.