Whatever you feel like. I started growing it again three years ago. I just kept forgetting to cut it.
It got 1/2 way down my back again. A female in the family here offered to trim off the dead ends… took off 1/2 a foot. [you figure out the metric]. Had a moment of, “Damn, there goes 8 months” but got over it.
I figured Wizards get their long hair when their hair is still color and not pure white, so I gotta start now.
Then again, maybe I’ll just shave it all off if I get bored. But I like it for now.