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If its shop purchased then it will carry a guide "use by". Mayonnaise has vinegar which helps to preserve it. 2 to 3 weeks at a low temperature is normally fine but you do need to follow the labels as there are many different makes with different ingredients

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12y ago
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11y ago

I wouldn't keep it out for more than 15-20 minutes after opening it myself. If it's never been opened then the shelf life is usually 4-6 weeks after the sell by date on the jar. Refrigerated it lasts longer.

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15y ago

This is a hearty product. It does need to stay refrigerated. It will last up to 2 weeks in the frige.

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14y ago

Just wait till it tastes bad or you get food poisoning from it

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Q: How long will open jar of mayonnaise keep in refrigerator?
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