How long can my hair get in a month and a half?

So I'm a 16 year old guy, as of now my hair is 1cm long... I have had it short for a while now.. I am on summer break, but yesterday I realized I want to change my look. I want to spike up my hair in like fo hawk style, cuz a lot of guys are doing it now. How long can my hair get in a month and a half if it... show more So I'm a 16 year old guy, as of now my hair is 1cm long... I have had it short for a while now.. I am on summer break, but yesterday I realized I want to change my look. I want to spike up my hair in like fo hawk style, cuz a lot of guys are doing it now. How long can my hair get in a month and a half if it tends
To grow fast?
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