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The USDA says that you should get rid of mayonnaise if it is left at more than 50°F for more than eight hours. Per their recommendation, I would keep it refrigerated after opening
http://answers.ask.com/Food_and_Drinks/Food_and_Co...
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Sometimes when feeding you baby breast milk you have to pump the milk and give it to the baby through a bottle but it can be difficult to know how long breast milk can sit at room
http://answers.ask.com/Food_and_Drinks/Other/how_l...
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Packets of mayonnaise are generally designed to be kept at room temperature, unless the label reads "keep refrigerated". The shelf life of the packets is only a couple months
http://wiki.answers.com/Q/How_long_can_Mayonnaise_...
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Don't leave them out any longer than 2 hours.
http://wiki.answers.com/Q/How_long_can_mayonnaise_...
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