The nail on your middle finger of your dominant hand grows faster than any .....

The nail on your middle finger of your dominant hand grows faster than any
other fingernail or toenail.
When comparing the growth of fingernails or toenails, it has been found
that fingernails grow at a rate of 1.2 inches (3.6 cm) per year, which is
about three times as fast as toenails. It is estimated to take fingernails
about six months to re-grow completely, and toenails take 12-18 months. It
is thought that fingernails grow faster perhaps because they are closer to
the heart and receive better blood circulation or because they are more
susceptible to trauma, which might actually encourage growth. Not all
fingernails grow at the same rate. The nails on the dominant hand tend to
grow faster, with the middle finger's nail growing the most quickly,
although it is not known why.


http://www.wisegeek.com/which-grows-faster-fingernails-or-toenails.htm?m