Fifteen seconds is this nice balance of capturing a moment, and also letting you download it quickly.. All the Details on Instagram's New Video Features. While most will say 15 seconds is still too short or limiting, heavy users of Vine might see it as too long.
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.
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.