There is no general answer to this question because hair growth is different for everyone. Several personal factors, such as sex, age and hormone levels, have an influence on the growth of your hair.
On average, hair grows:
0.3 to 0.5 millimetres per day
1 to 1.5 centimetres per month
12 to 15 centimetres per year
To have long hair, you need a little patience, a balanced diet and the right hair care. A caffeine shampoo can help extend the growth phases of your hair and support you in achieving your hair goal.