SSDI benefits last as long as your disability prevents you from working. In some cases, where you can return to work part-time, you can continue receiving supplemental SSDI benefits to make up the difference between your full SSDI benefits payment and what you earned from working. Additionally, your benefits are not indefinite. According to the SSA, due to advances in medicine, people with disabilities could recover and be able to return to work. Therefore, your claim is reviewed occasionally, and if the SSA deems you no longer have a qualifying disability, your benefits will stop. However, you can appeal this decision. Should your disability continue to retirement age, your SSDI will be converted into social security retirement benefits, and you will no longer receive SSDI.