Habits and Painting

I heard some where that it takes 21 days to form a habit. I have been in the habit of painting one small painting a week since the beginning of September. I cannot imagine at this time doing it every day like Duane Keiser or Julian Merrow-Smith because of my full time teaching position and other peripherals in my life. On the other hand if I am not painting or drawing I feel kind of like I have an itch that needs to be scratched. I am not sure there will every be a sense of balance between painting and life. I seem to paint furiously to the exclusion of everything else or work and focus on family to the exclusion of my painting. I have come to realize that worrying about a painting being perfect is a prescription for paralysis. I just keep painting and some are better then others but I have no chance of making a great painting unless I keep painting. Sounds simple. I think I keep painting because it is such a challenge and never boring. Doing it on a regular basis becomes a kind of meditation.