Books like The World's Writing Systems
William Bright, Peter T. Daniels
The World's Writing Systems is 1,036 pages, about 19 hours at 250 words a minute.
9 books to read next
How long each takes
Writing Systems 4.3 h They Say / I Say 8.5 h 
Of Grammatology 8.2 h 
Alif Baa 4.6 h 
Orality and Literacy 3.7 h 
The Only Grammar Book You'll Ever Need 3.5 h 
The Story of Writing 4.1 h 
You Can Learn the Korean Alphabet in One Morning 1.8 h Baybayin, the Ancient Script of the Philippines 59 min Bar height shows length. Estimated at 250 words a minute.