To be an anarchist, you have to consciously identify as an anarchist-- with anarchism. If someone or some people act intentionally with principles that anarchists align with like mutual aid, direct action, voluntary cooperation, horizontality, etc., then you can call them anarchistic.
As far as what amount of practice it takes to call yourself an anarchist...
Anarchists value principles like mutual aid, etc. If I value these things and don't practice them, am I an anarchist? Am I a capitalist if I don't value capitalist principles but sell a book at a profit to stay alive in a system that is enforced upon me? Am I an anarchist if I'm unwilling to risk life in a steel box, or even just the threat of attention from cops to act directly for my desires?
I'd say yes, if you value anarchist principles and call yourself an anarchist, you are an anarchist, regardless of where you are in your practice.
...but... to borrow from Crimethinc... free is a verb, not an adjective.