These are some of the most popular jobs in the US, compiled in one list of jobs many Americans have. On December 5th, 2016, Amazon revealed they will be launching a new grocery store called Amazon Go that will eliminate the need for cashiers.
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.
If you unplugged the fridge when you weren't using it, I suspect when you plugged it back in it would only take a few hours to cool down. Under normal usage a fridge will have its compressor running about 1/3 of the time, so this will be a meaningful savings. (The fridge uses the vast majority of its electricity running the compressor, so how long it's running for is a good proxy for electricity consumption.). Wear on Refrigerator. Cycling of the fridge compressor on and off is a primary cause of wear, so unplugging the fridge should be a benefit in that respect. Plus there will be total fewer runtime hours. I don't see how unplugging the fridge for days at a time could possibly damage it.