Long hair is very beautiful, but it takes time to grow luxurious hair. Don't be discouraged - here are the top tricks to speed up this process. Hair growth rate is primarily determined by genetic predisposition. If growth hormone prevails in one of the parents, then it will be transmitted in a greater equivalent to the child. In general, hair grows on average 0.3-0.5 millimeters per day, 1-1.5 centimeters per month, and 12-14.5 centimeters per year. Reading life hacks for the growth of hair on the head, a girl needs to understand that if she dreams of growing curls to her back in just two weeks, she should not frantically buy even the most expensive and effective means.