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Repeated opening or prolonged opening causes the refrigerator to lose cooling as well as goes for wear and tear. So, how long should a refrigerator last is up to you, if you want your refrigerator to last upto 14 -17 years, you should take care of the factors that determine the lifetime of the refrigerator.
Tell your little ones not to open the door. An unopened refrigerator will keep foods safely cold for about 4 hours. A full freezer will hold the temperature for approximately 48 hours, 24 hours if it is half full. If it looks like the power outage will be for more than 2-4 hours, pack refrigerated food items such as milk, dairy products, meats, eggs, and left-overs into a cooler surrounded by ice. Try to obtain block or dry ice to keep your refrigerator as cold as possible.