[newfoundglory]

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 :)

[taneq]

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.)