The growth rate of human scalp hair is:
1/100000000 mph or 10^-8 mph.
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Oh, dude, the average human will grow about 590 feet of hair in a lifetime. That's like the length of two football fields! So, if you're ever in a hairy situation, just remember you've got plenty to spare.
The traditional answer is probably something like dimensions of a city or agricultural field or aircraft runway. But ANY length can be expressed in miles. The thickness of a human hair (say 100 micrometers) is approximately 6x10^-8 miles.
0.000095meters = 0.095mm Dia of Hair = 0.095 + 10 = 10.095mm Diameter = 10.095mm
a lot of protein seems to have a great affect on hair growth. it also makes your nails grow very quickly.
If a person is on a well balanced diet and treats their hair good, it could take 3 years.