The answer is, it depends. Catalytic converters can last anywhere from 20,000 to 50,000 miles, but several factors can affect their longevity. For example, if a catalytic converter is exposed to excessive amounts of heat, it can degrade more quickly. Additionally, if a catalytic converter is not properly maintained, it can become clogged and stop working altogether. As a result, it's important to keep an eye on your catalytic converter and have it serviced regularly to ensure that it lasts as long as possible.