See Mortimer Adler's How to Read a Book.
As Adler notes, followed by "How to Read Two Books".
He also addresses how to usefully access the concepts in many books. You don't do it by reading them exhaustively. Rather, your approach becomes more of a conversation --- asking questions of the book. But also of research, in the sense that you're assembling a structure of information and models. What you read either builds, restructures, or removes portions of that structure. (Don't just read to confirm, read to challenge beliefs.)
I try to track what I'm reading and come up with a sense of what my pace and cadence are. That also lets me know how much I can possibly.
At which point I generally realise I'm spending FAR to much time with inconsequential or low-value material.
(All the more reason to constantly be tuning for higher-signal / lower-noise.)
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