How long does it take the caffeine in a 12 ounce can of Diet Coke containing 46 milligrams of caffeine to wear off?

In healthy adults, caffeine's half-life is approximately 4.9 hours. In women taking oral contraceptives this is increased to 5–10 hours, and in pregnant women the half-life is roughly 9–11 hours.

In general, 25 to 50 milligrams of caffeine is sufficient for most people to report increased alertness and arousal as well as subjectively lower levels of fatigue.
http://en.wikipedia.org/wiki/Caffein..._and_half-life

So, in a healthy adult, it would take at most (46-25)/(46/2)*4.9 = 4.47 hours for the noticeable effects of said amount of caffeine to wear off.

You say that like its a bad thing!

Yea, I figured it would be more

These days if I drink one cup of coffee I will find it very hard to sleep .
About ten years ago tough I used to drink two strong cups of coffee every day . Then a doctor told me it is not good for me . So gradually I stopped drinking it . Now I feel better without having to drink coffee to give me a boost in thge morning and in the afternoon . Last time I drank coffee was when I had to travel by plane for 9 hours no stop at all .

ha ha...wear of. i am not laughing but 'wear off'? seriously though, some people seem to have a problem drinking caffeine.

i am all wired up...

What is so funny about the words 'wear off'?

Nothing, John is however, a moron.

I'm down to two cups, in the morning only. I used to drink between six and eight cups a day, and when I stopped, well, I went though full caffeine withdrawal. I had a headache for three days solid, it felt like someone was trying to cut out my right frontal lobe with a wooden spoon.

I bought a percolator, this helps a lot, I put it on in the morning, and it keeps coffee hot for two hours, so after that, no more coffee. Previously using instant, or a cafetiere, it was all too easy to make a fresh cup at any time.

they do have 1cup coffee makers:P I had one!! It was AWESOME!! But now I drink 1 cup if dad is home and 2 if he isnt.. haha.. i feel it flow threw me and I am like SCORE!! Then stuff gets done, then I get lazy again.. haha. but I can go awhile without caffeine.. but I crave the coffee flavor, and my soda flavors.. hahaa..dam..now i want a cherry coke

I have been drinking more than usual. Normally, I drink one cup or sometimes two, lately I am up to 4 or 6. I am working on a project, so I think it is only a temporary desire to drink coffee.

That said, I don't go through withdrawals at all, and normally I can skip days and not even think about it. Coffee\caffeine, to me, is pretty much like drinking water, and I hardly drink water so a little extra coffee doesn't hurt me. Some people get jittery about coffee and if that is the case should not drink it.

I have one cup of coffee that I make in the morning. I use a coffee scoop so it's a single shot (even though the cup is large). I always have Lavazza Coffee medium roast. A work mate I know drinks 4-6 cups a day at the local cafe' (a large is a double shot - something the coffee cart doesn't seem to do - which is odd as they charge more for a large). Anyway, if I have a coffee with him (he's always asking me to go) I feel sick to my stomach. So I usually just walk over and either get a small or ask for a juice.

I drink coffee throughout the entire day at work. I have to drink a lot because it's so watery and weak. Nobody at my office knows how to use the right amount of coffee grounds. You shouldn't be able to see the bottom of the cup when it's full. Luckily they have tea I can drink if a particularly weak pot of coffee is sitting there.

On weekends I brew a nice large fresh cup of coffee in my french press.

that is when YOU take it over