This particular habit I've been cultivating for over five months. I stopped for a week because I was insanely busy, and I'm taking a break from my medication. I couldn't motivate myself to do it after going off, and I was worried I was only doing it because I was medicated. I'm happy to say I'm doing it today to prove myself wrong.
If only it were so easy to break bad habits.
The trick to that is to replace one bad habit with another (preferably less-bad) habit, that last bad habit was getting kinda boring anyway.