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A typical mini refrigerator will take at least four hours to cool down after being plugged in. If time permits, waiting a full 24 hours will ensure that the refrigerator is completely cooled to the temperature to which it has been set.
Confidence votes 22.7K. It takes at least 2 - 3 hours to get completely cold if it's empty, up to 24 hours if it has food in it. But the food will still be kept cold enough during the original cooling process.ule of thumb is generally 48 hours in the refrigerator. It does not take more than 8 hours to properly marinate, but anything over 48 hours is too long. After 48 hours, the s â¦ alt in the marination will toughen the meat and reverse the process of meat tenderatization.