How Long Does Onion Last Once Cut Up?
Once an onion is cut up, it can last for up to 7 days if it is stored properly in an airtight container in the refrigerator. However, it is best to use the cut onions within 2-3 days to ensure maximum freshness and flavor. Cut onions left at room temperature for more than 2 hours should be discarded to avoid potential foodborne illnesses.