In cases where it's unlikely that anything in the photo should be gray, your best bet is to color correct the highlights and shadows and leave the midtones alone. If there is an area that's supposed to be neutral gray, though, this technique will find it.
An average person spends 14-15 years of their life on the toilet.  (true)   another interesting fact - an average person spends 3 days of their  life sitting at a red liâ¦ght.
Then I don't think it matters how much you spend on a computer. If you're doing anything important, than 30 minutes of surfing is ok. If you're shopping for something and trying to find the best deal or looking at reviews and researching, than 1 to 2 hours is ok. I spend about 5 to 8 hours a day on mine.