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Average monthly hair growth is about 1/2 inch, or about 12.7 mm. At this rate, the hair will grow to about 152.4 mm (6 inches) per year Source: http://goliath.ecnext.com/coms2/gi_0199-5042337/Hooray-for-hair.html, http://www.naturallycurly.com/curltalk/archive/index.php/t-3609.html
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