That depends on your condition and how well you respond to treatment. As a general rule, acute conditions with sudden onset, such as pulling a muscle in your back, will clear up quickly, sometimes after only one treatment. The longer you have had a condition, the more severe it is, and the older you are, the longer it may take to treat it. A series of 10 – 12 weekly or bi-weekly treatments can resolve many chronic problems. A severe condition such as recovery from a stroke, or a degenerative condition such as multiple sclerosis will probably require ongoing treatment over time to achieve satisfactory results. A fair test to see if acupuncture will improve your condition is to have two treatments per week for two to three weeks. At that point, most people can judge whether or not they are receiving sufficient benefit from treatment to continue with it, even if they are not cured yet.