The first time was for about seven or eight years in the 1970's. I'd had an old b&w, that a friend borrowed when I was on vacation and he never returned it. I didn't miss it. The only reason I went back to having a TV was because I then moved in with the man I married. I kept on trying to persuade him to give up the TV, but no luck.
Twenty-five years later I got divorced and relocated halfway across the country. I didn't get a TV when I moved because I didn't want to spend the money for one, nor did I want to spend the money for cable or satellite. It started simply as an experiment, and I figured I'd get a TV after a while, but it's been five years so far and I just don't miss it. I hate visiting my sister because the TV is always on at her house. It's not necessary, really, to have it on all the time. On the plus side, she does only have one TV, unlike most folks who seem to think they must have one in every room in the house.
Oh, and when I did have a TV and my boys were growing up, we had one and only one TV.