How long can mayonnaise that has been opened be stored in the refrigerator?
The United States Department of Agriculture, Food Safety and Inspection Service, states that mayonnaise is safely stored in the refrigerator for 2 months. The refrigerator should be kept at 400 F .
Reference: http://www.fsis.usda.gov/oa/pubs/basics.pdf
For more Food Safety Information:
1. USDA Meat and Poultry Hotline 1 (800) 535-4555
2. Web site: http://www.fsis.usda.gov/