How Long Can Mayonnaise Be Left Out?

Answer

Homemade mayonnaise can not last more than two days outside of the refrigerator. To be safe, you can only leave it out one day. On the other hand, commercially prepared mayonnaise uses pasteurized eggs, meaning that you can leave it out for a longer duration of time.
Reference:
1 Additional Answer
Mayonnaise should not be left out for very long, or it will spoil. The eggs and oil both ferment quickly and it can make you very sick if you eat it.
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