Books like Dvoretsky's Endgame Manual
Mark Dvoretsky
Dvoretsky's Endgame Manual is 413 pages, about 7 hours 34 minutes at 250 words a minute.
7 books to read next
How long each takes
Silman's Complete Endgame Course 9.7 h 
Practical Chess Endgames 2.6 h 
The Soviet Chess Primer 7.3 h 
Chess for Dummies 6.8 h 
100 Endgames You Must Know 4.0 h 
Basic Chess Endings 10.9 h 
The Complete Book of Chess Strategy 6.6 h Bar height shows length. Estimated at 250 words a minute.