When I was younger I had very long hair. At one point I remember being strangely proud that I could sit on it!
Hair grows from the base of your scalp through your folicle. It has three phases of growth: the anagen, the telogen and the catagen. The anagen is the first phase with new hair growing in the hair bulb. The catagen is the next phase when hair stops growing because the cell division has stopped. The telogen is the last phase and the new hair starts growing and the old hair falls out.
I’ve got some ace hair facts for you.
Your hair grows differently at different times of the day. It’s slower in the day than at night and hair grows at 1.7 × 10−8 km/h. That is slow! That’s about 12 mm per month.