Books like Refactoring
Martin Fowler
Refactoring is 464 pages, about 8 hours 30 minutes at 250 words a minute.
7 books to read next
How long each takes
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An Introduction to Object-Oriented Programming With Java 17.4 h 
Object-Oriented Programming in C++ 19.1 h 
Understanding Object-oriented Programming with Java 7.7 h Bar height shows length. Estimated at 250 words a minute.