Mayonnaise?!
Answers: How long does mayonaisse last if left out on the counter?
unless your having a heat wave in kitchen then it would take 2 hours before it would get close to room temp-then it would take a few more hours before bacteria even had a chance to grow so i say to be safest no more then 2 hours before throwing it away
If is has been sitting out for over an hour, then toss it. It is far to dangerous to play Russian roullette with something like that.
once mayo is opened should be kept in a fridge throw it away to be on the safe side..........
Since mayonnaise is basically eggs and oil, it will make you really sick if it is spoiled. Throw it out.
I really don't know the answer. I have never left it out of refrigerator for more than an hour at a time after opening. I don't use a lot and it usually lasts me about 6 months.
30 mins.
not long but it depends on the temperature of the room