Does this sentence mean "I have spent many days that I would not redo" in other words?
This sentence is very confusing. "Not a day goes by" means "every day". "I would not redo" at first appears to refer to not wanting to redo "every day", but it actually has the opposite meaning. Because he says "not a day goes by" and "not redo" (a double negative), this sentence has the meaning "I would redo every day (I've spent with you)."
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