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How many days at a time? I used to drink a lot of coffee on weekdays but none on weekends and didn't notice it making any difference. Stopped drinking coffee altogether and after a few days I was really noticing the difference, and it took about two weeks for the withdrawals to wear off.

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Six weeks, once (mostly to prove it for conversations like this), more often something like 2-6 days. I can really take it or leave it as caffeine, but keep drinking stuff for flavor and enjoyment - if they made decaf red bull I could give up caffeine tomorrow :)

Fair enough, it does seem like different people react to it in sometimes markedly different ways so I don't disbelieve you.

(As an aside, it's an interesting problem how long is 'long enough' when proving you can go without something.)

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