The worst thing young adults can do is go to graduate school because they aren't sure what else to do or they can't find jobs. Grad school, after all, is often an extremely long commitment. A Ph.D., for example, can take six years.
The average lifespan for an air conditioner is 10 to 15 years. Some air conditioners last up to 20 years. As interesting as these data points may be, they don't tell you the whole story. The issue is that a variety of factors affect the lifespan of an air conditioner.
How long should it take a new RF to cool? I installed a GE Profile side x side yesterday and in 24hrs there has been little change in temperature. I call customer support and am told it's not cooling because there's no food in the fridge (I kid you not) and that I need to put food in it to get it to cool.