as a general guideline for refrigerated cooked food, including fast-food items like sausage biscuits, it is recommended to consume them within 3-4 days to ensure their safety and quality. After this period, the risk of spoilage and potential foodborne illnesses increases.
To get the most accurate and up-to-date information, I recommend checking with McDonald's or referring to the packaging or information provided at the time of purchase. Always use your best judgment and discard any food that appears or smells off or unusual, regardless of the stated shelf life.