In terms of how long your chiropractic adjustment should last, there is no simple answer. A chiropractor's treatment plan and time frame are largely determined by the patient's age, fitness level, pain duration, type of injury, and level of discomfort.   After the first visit, patients typically experience a reduction in pain of 40-80%, depending on the severity of their spinal injury. Generally, improvement occurs within 1 to 4 weeks after starting chiropractic treatment.