I am from the tech industry. Actually I would say 4 years roughly. It will take 2 years for some one from the tech industry but from non tech added 2 more years. But then if you do not have thing for creativity or colors it would take long. I started as back end developer but over the years got...
I am not using any since ISP filters most of the virus.
Thought Kaspersky was the best.
In my experience especially in corporate environment with 25 people working 24 hours with pictures, Kaspersky is the best.