For most people your hair grows half an inch a month. In 5 month your hair should be 2 1/2 inches longer
How Long Will Hair Grow In 5 Months?
It grows about 1 and a half inches a month .
There is no exact formula for hair growth. It mostly depends on the way you treat your hair and on your hair type. What you can do is to be patient, eat properly, try to avoid chemicals and use organic hair growth shampoo and other natural products.
About 2 1/2 months, that's why when you're thinking of cutting it all off? Realize how long it takes to grow back, about 1/2 an inch a month, that's it.