How long can an open jar of mayonnaise be left unrefrigerated and still be usable?

To maintain quality, Kraft® recommends a maximum of  1 – 2 hours.   A suggestion: just put out as much as you think will be needed for that meal or party, and leave the jar in the refrigerator.  Then discard the leftover portion  that has been on the table.
 
Source(s):
Kraft® customer service phone message

 
 

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