1 day to 9 days
Caffeine-withdrawal headaches can last up to 48 hours and can be as intense as a migraine headache. Withdrawal symptoms can begin 12 to 24 hours after the last cup of coffee and can last up to 1 week. These symptoms can include lethargy, extreme nervousness, irritability, sweating, headaches and shakiness. Withdrawal symptoms can start from 12 to 20 hours after your last cup of coffee and peak about two days later and can last about as long as a week, Kuhar added. It is not just coffee that can lead to caffeine withdrawal. While a 6-ounce cup of brewed coffee contains about 100 milligrams of caffeine, tea and cola have about 40 milligrams each, a bar of milk chocolate has about 10 milligrams and hot chocolate has about 7 milligrams. 3. Taper caffeine: One way to know that you may have a caffeine withdrawal headache is if you are waking with a headache and when you drink coffee etc, the headache improves. It is less painful to gradually taper your intake of caffeine over a period of weeks to avoid the withdrawal headache.  In general, it takes anytime from 1 day to 9 days to get over caffeine withdrawal. Not everyone experiences noticeable caffeine withdrawal symptoms, so it's plausible to suspect that the continuum starts at 0 days. Also, most of these papers report noticeable symptoms-it's possible that the duration of neurophysiological effects (as discussed at http://www.ncbi.nlm.nih.g ov/pmc/... The Withdrawal Process. If you quit taking caffeine cold turkey (without slowly reducing how much you ingest), you'll likely suffer from withdrawal symptoms. The most common symptom of withdrawal is a very bad headache. In fact, these very intense headaches can feel similar to a migraine. This initial headache can last up to 48 hours. What Caffeine Does to the Body. Caffeine affects the body in a variety of ways. It stimulates the central nervous system, improves mood and creates feelings of alertness, reduced fatigue, boosted endurance and mental activity. It speeds up the heart and constricts the blood vessels. Caffeine is more likely to cause diarrhea by speeding up movement in the body of food. If you talk to some caffeine users, they will tell you it let’s you down, and that may be because folks usually drink coffee but are not drinking it like water in which they’ll take a sip, and 1 hour later take another sip. In general, withdrawal for most people lasts between 7 and 14 days to fully recover. It should be noted though that any substance that your body becomes dependent upon for everyday functioning may have an even longer withdrawal. There are cases of people experiencing withdrawal symptoms well after 2 weeks. Amount of caffeine you drink. Caffeine amounts typically range from 16 mg to 160 mg. Coffee typically has about 135 mg of caffeine, whereas an energy drink may have up to 160 mg. Various types of tea typically have between 15 mg and 40 mg of caffeine. In general, withdrawal for most people lasts between 7 and 14 days to fully recover. It should be noted though that any substance that your body becomes dependent upon for everyday functioning may have an even longer withdrawal. There are cases of people experiencing withdrawal symptoms well after 2 weeks. Detoxing is No Laughing Matter. Advertisement. Caffeine withdrawal is a very unpleasant experience. The symptoms of withdrawal only last a few days to a week for light caffeine consumers but can last 2 months or more for those that had been consuming around 1000 mg or more daily. If you are or have been an avid coffee or energy drink consumer then you are aware of how addictive caffeinated beverages can be. Just a few hours after missing your scheduled dose the caffeine withdrawal symptoms start to set in. Caffeine withdrawal is now a recognized disorder and is listed in the DSM-5. If you’ve ever completed a caffeine detox you know how difficult and painful quitting caffeine can be The more caffeine that you take in, the longer your withdrawal period is likely to be, according to research at Johns Hopkins University published in the October 2004 issue of “Psychopharmacology.” Researchers found most people developed withdrawal symptoms within 12 to 24 hours after stopping caffeine. 
http://www.ehow.com/how-does_5187957_long-caffeine-withdrawal-take_.html http://www.cnn.com/2009/HEALTH/04/06/hm.caffeine.withdrawal/index.html https://www.healthtap.com/topics/how-long-does-caffeine-withdrawal-headache-last https://www.quora.com/How-long-does-it-take-to-get-over-caffeine-withdrawal http://www.livestrong.com/article/25627-long-caffeine-withdrawal/ http://mentalhealthdaily.com/2014/03/25/caffeine-withdrawal-symptoms-how-long-do-they-last-average-timeline-varies/ http://mentalhealthdaily.com/2014/03/25/caffeine-withdrawal-symptoms-how-long-do-they-last-average-timeline-varies/ http://www.caffeineinformer.com/caffeine-withdrawal-symptoms-top-ten http://www.livestrong.com/article/554353-how-long-to-get-energy-back-after-quitting-caffeine/
withdrawal from caffeine how long does it take