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I can't say my memory is any better. People make lots of vague claims of cause-and-effect: they stopped fapping to porn, and their eyes get better; their hair is thicker; they have no acne, their toenails look glossier! (OK, I made up the last one.) I have a hard time believing this is objectively real -- as opposed to something of a "placebo effect."
As to your second question: all I can say is that the more we separate ourselves from porn and the mental stimulation that goes with it, and is magnified with masturbation, then the better off we'll be. That's what "rewiring" means. And it stands to reason that the fasting from porn needs to be more than a few hours or even a few days. Weeks and months.
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