Books like The Screenwriter's Bible
David Trottier
The Screenwriter's Bible is 350 pages, about 6 hours 25 minutes at 250 words a minute.
7 books to read next
How long each takes
How to Write a Movie in 21 Days 3.5 h 
The Complete Book of Scriptwriting 6.3 h 
The Elements of Screenwriting 2.6 h 
Writing Screenplays That Sell 5.9 h 
The Writer's Guide to Writing Your Screenplay 4.1 h 
The Complete Guide to Standard Script Formats 3.1 h 
Teach Yourself Screenwriting 6.0 h Bar height shows length. Estimated at 250 words a minute.