How long does it take for a toenail to grow back?

umm...well if you leave the toe that doesn't have a nail exposed it'll take..about 4 somtimes to 12 months to fully be back and strong. If you keep it wrapped up in a baindaid with some cortozoin and soak it in nail strengthener that you can buy at CVS stores or pharmacys or you could even make it at home and drink lots of milk your nail should be back within 2-6 months