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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

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7y ago
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14y ago

when you leave it out to long it has a odor and when it gets hot

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11y ago

prob 3-4 hours at lest

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Q: How long does it take mayo on a sandwich at 70 degrees to go bad?
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