With proper care and regular feeding, your San Francisco Sourdough Starter can last indefinitely. In fact, there are sourdough starters that have been passed down through generations and are over a hundred years old! Just remember to feed it regularly and keep it in a stable environment, and it will continue to provide you with delicious sourdough bread for years to come. If you ever need to take a break from baking, you can also refrigerate your starter for a few weeks, or even freeze it for longer storage.