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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.
In the event of a power outage, it is important to keep your refrigerator closed as much as possible to keep the temperature safe for as long as you can. Food can stay safe for up to 12 hours in a refrigerator without power, but it will spoil quicker if you keep opening and closing the door.