Books like The Art of Defence in Chess
Lev Polugaevskiĭ, Lyev Polugayevsky, Iakov Damsky
The Art of Defence in Chess is 268 pages, about 4 hours 55 minutes at 250 words a minute.
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How long each takes
Modern Chess Openings 8.4 h 
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Batsford Chess Openings 6.3 h 
Chess Openings for Dummies 7.1 h 
Chess Openings 4.7 h 
The Complete Book of Chess Strategy 6.6 h Bar height shows length. Estimated at 250 words a minute.