I've just bought my first Macbook pro (Retina), I'm wanting to replace my custom built desktop. I'm moving away from gaming and trying to use the macbook for professional work. I leave my computer on for about 16 hours a day plugged into the wall, and wondering if this would be bad for the macbook. Could I leave it on for the majority of the day (plugged in to the wall)? Does this decrease the lifespan of the macbook? -Curious new macbook pro owner (soon-to-be).