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Douglas Hofstadter's "Gödel, Escher, Bach: An Eternal Golden Braid" was a bit like this for me. I liked it but there were short sections that took me days to get past. It was dense with information and logic that was worth working through, to me. I don't recall how long it took me to finish the entire book but it might have been six months, alternately reading other lighter books.
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