Ritalin withdrawal can vary in duration and intensity depending on the individual and their usage pattern. Generally, acute withdrawal symptoms such as fatigue, depression, irritability, and anxiety can start within hours to a few days after the last dose and can last for several days or weeks. However, some people may experience post-acute withdrawal symptoms (PAWS) which can last for several months or even up to a year. PAWS symptoms can include persistent fatigue, mood swings, difficulty concentrating, and sleep disturbances. It’s important to note that Ritalin withdrawal should always be monitored by a healthcare professional, and quitting Ritalin cold turkey is not recommended.