Withdrawal anxiety can last anywhere from a few days to several weeks or even months, depending on the individual, the substance or behavior they were addicted to, and the severity of their addiction. It is important to note that withdrawal anxiety can be a symptom of various types of substance or behavioral addictions, and may require different treatment approaches based on the underlying cause. In some cases, medication and therapy may be used to manage withdrawal anxiety and other symptoms of addiction. It is recommended that individuals seeking help for withdrawal anxiety or any other addiction-related issues speak to a qualified healthcare professional for personalized guidance and support.