Detox from Xanax usually lasts between four to seven days. However, symptoms can begin to show within the four hours after your last dose and last up to a month. Specifically, the first symptoms of withdrawal are increased heart rate, mood swings, insomnia, nausea, and vomiting. Moreover, during the first three days, individuals are at a higher risk of seizures.After the first couple of days, the most severe symptoms will more than likely be behind you. However, the first week will bring about symptoms such as depression, anxiety, and extreme cravings.By week two, the chance of suffering from severe seizures is much less than the first three days. Furthermore, your overall reactions will be less severe in general. Unfortunately, you will continue to experience insomnia and other emotional changes.Weeks three and four of Xanax withdrawal symptoms will mark the end of the withdrawal process. During this time, you may still experience some insomnia, but this is less likely than before. However, headaches and sensitivity will still be present.