How long does it take to grow 5 inches of hair?

It takes three months for one inch, leading into a simple multiplication problem.

5 (inches) times 3 (months)

5*3=15

15 months.

1 year, three months.

_______________ Correction:

Hair grows approximately 1/2 inch per month. In order for it to grow 5 inches, it will take about 10 months.