How long does it take for a tree frog to grow its leg after being cut off?

It depends on the age of a frog, the circumstances and chance of infection. A cut-off like wound has a smaller chance of infection than a rip-off wound. If the frog is just a froglet, the leg will grow faster compared to an adult species. If the circumstances are bad (food shortage, too much parasites infecting the frog) this will have a negative impact on the healingprocess.