Are there certain books that it may not matter whether or not you reach its finish line so long as you learned all you needed?

I’m a very slow reader reading a 700+ page book. Because of what it contains I’m going to push through it as far as possible. I just have to find the right audio book.
Are there certain books that it may not matter whether or not you reach its finish line so long as you learned all you needed?
Are there certain books that it may not matter whether or not you reach its finish line so long as you learned all you needed?
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