Books like Modern Chess Openings
John Herbert White, Richard Clewin Griffith, Walter Korn, Nick de Firmian
Modern Chess Openings is 457 pages, about 8 hours 23 minutes at 250 words a minute.
6 books to read next
How long each takes
Discovering Chess Openings 3.2 h 
Batsford Chess Openings 6.3 h 
Chess Openings for Dummies 7.1 h 
Chess Openings 4.7 h 
The Art of Defence in Chess 4.9 h 
The Complete Book of Chess Strategy 6.6 h Bar height shows length. Estimated at 250 words a minute.