Hair is in the growth (anagen) stage of its cycle for up to 2-8 years. There is a lot of variability, but on average, human scalp hair grows about 1/2 inch a month.
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Hair is in the growth (anagen) stage of its cycle for up to 2-8 years. There is a lot of variability, but on average, human scalp hair grows about 1/2 inch a month.