Two or three days, not counting the day you bought it.
3 weeks if refrigerated, 2 weeks if not. :D
Mayo last appeared in the All-Ireland Football Final in 2013, when they were beaten by Dublin. They last won in 1951.
Bought readymade, the best-before-date will be on the container. Made at home, the best-before-date of the mayo will be on the jar. If the dip has been kept refrigerated, then those dates will apply. Otherwise, I would be wary of any dip which was more than a few hours out of a fridge.
Due to the contents of Mayo (mostly the creams and raw eggs), it is hazardous to keep mayo if the jar has gone warm for longer then an hour.
it doesnt because it has expired is this a trick question?NOTE: Update by new author: Hellmann's Mayo shows a "Best if used by" date. Not an expiration date. Opened and then closed and then refrigerated jars/packages last a very long time. Some people like to go by expiration dates or best if used by dates but I prefer the old fashioned method.Open the container; Smell the product; View the product; Taste a small sample; If all are good then it's most likely safe to consume.In fact, I just had some Hellmann's Mayo from an Easy Out squeeze container that said "Best if Used By: SEP0913" and today is OCT0714!I opened the container and smelled it. Smelled like normal mayo. I looked at it. It didn't look watery or dark; it looked normal. I squeezed a small amount out onto my finger; felt like normal mayo consistency; tasted it; tasted absolutely fine.I added it to my tuna fish and had a lovely lunch. :-)If something doesn't pass all of the above tests, you may wish to discard it.
mayo is made several different ways, so look on the jar to see best used by date. because some mayo has eggs in it , and of course organic won't last very long. because most are made with vinegar so mayo will last a very long time.
Unopened it will last on the self for a year or more. But once it is opened, it will last a couple of months in the fridge. If you've opened the container or used mayo on a sandwich or in a salad, it shouldn't be left unrefrigerated for more than a couple of hours.
look at the expiration date, if its in the jar in the fridge it should last about 2-3 months. if its on a sandwich it should last a few hours, depending on how cool it is. In my opinion mayo can not go bad in 3 to 4 months because of the vinegar that preserves it
According to "The Association for Dresses and Sauces," commercially available mayonnaise can be left out of the refrigerator for a long time and still be safe. Apparently, the eggs used in commercial mayo are pasteurized, killing bacteria like Salmonella. Also, they say, commercial mayo is sufficiently acidic to be unfavorable to bacteria that may be introduced after opening the jar. I always assumed that Salmonella was the prime problem, but if you think about it, mayo sits on store shelves unrefrigerated for a long time, and there's no reason Salmonella couldn't grow then. TADS also says the reason refrigeration is recommended by the mayo jar is to preserve fresh taste.
About 5 - 10 minutes
Yes. More than enough. As long as you were thourough with applying the mayo - that's plenty of time.