“I can stop any time I want!”
Not touching alcohol for 12 hours a day does not mean you are not an alcoholic.
If someone stops drinking for a long enough period, with no urge to return to drinking, then yes, they aren't an alcoholic. You just made up a silly 12 hour window so you could beat a straw man to death.
When you are staring at a wall all day, you can probably think of a lot of other things you could do and did. When you stare at a wall all day, and think of nothing and enjoy it, then I would say you have mental problems. The problem isn't that you do something for a long time, the problem is that you can't think of something else or can't control you to do something else, even if you want.