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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.
Obviously, the food is in the fridge to keep it from spoiling and without power to the appliance, it will eventually go bad. But how long does that take? The U.S. Department of Agriculture says the average refrigerator will keep food cold for about four hours without power, as long as you keep the doors closed. The more you open the door, the shorter that period becomes. A powered refrigerator temperature should be 40 degrees F or lower and the freezer should be 0 degrees F or lower.