Unopened, commercially produced mayonnaise is almost indefinitely shelf stable. Once opened and refrigerated, it may remain safe to consume for two to three months beyond its "purchase by" date. Its color and flavor, how... More »

Mayonnaise should not be left to sit out at temperatures above 50 degrees Fahrenheit for more than 8 hours. After 8 hours, eating mayo can pose a threat of food borne illness. More »

Mayonnaise does not have as long of a shelf-life as many people think, and should not be left out unrefrigerated for more than a couple of hours. Leftovers that have been refrigerated immediately after preparation can be... More »

Unopened containers of mayonnaise have a maximum shelf life of three months. Opened containers of mayonnaise have a maximum shelf life of two months if refrigerated after opening. Opened containers of mayonnaise should n... More »

Ground coffee that has been opened has a shelf life of 2 to 3 weeks. In order to maximize the shelf life of ground coffee and maintain its freshness, it should be stored in an air-tight container. More »

Hard boiled eggs have a shelf life of one week if stored in the refrigerator or two hours if left out at room temperature. The protective waxy coating on the eggshell is stripped away in the hard boiling process, leaving... More »

The shelf life of shortening depends on the type of product that it is, but shortening does expire; for example unopened cans and shortening sticks have a shelf life that is about 2 years from the manufacturing date, whi... More »