How long is mayonnaise good for when its refrigerated and opened after the expiration date?

Opened mayonnaise can typically last for about 2 to 3 months in the refrigerator after the expiration date, as long as it has been stored properly and shows no signs of spoilage, such as off odors or changes in texture. It's important to check for any visible signs of mold or unusual separation before use. Always use a clean utensil to avoid contamination. If in doubt, it's best to err on the side of caution and discard it.