Books like The Poisoner's Handbook
Deborah Blum
The Poisoner's Handbook is 328 pages, about 6 hours 1 minute at 250 words a minute.
6 books to read next
How long each takes
Principles of Forensic Toxicology 7.7 h 
Fundamentals of Forensic Science 12.6 h 
The Lives They Left Behind 3.8 h 
Forensic Detective 4.8 h 
Cracking Cases 5.8 h 
Never Suck A Dead Man's Hand 6.2 h Bar height shows length. Estimated at 250 words a minute.