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Cream cheese frosting shouldn't be out of the fridge for more than an hour or so, especially on a hot day. (On a cool day, you may be able to get away with leaving the frosting out for a little longer.) When cream cheese is left out at room temperature, it starts to soften. Whipped cream cheese starts becoming a regular, un-whipped cream cheese when it warms. Since most cream cheese frostings involve whipped cream cheese, you're best off leaving the frosting in the fridge until you need it.