How long can sour cream be left out of the refrigerator, say, at a party?

Put sour cream back in the refrigerator immediately after using it.  Party dips made with sour cream should not be left at room temperature for more than 2 hours, or 1 hour at 90° F or above.
 
Source(s):
Dr. Robert Bradley, professor emeritus of food science, University of Wisconsin 
FDA Factsheet: “Kitchen Companion”

 
 

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