How long is the salamanders life cycle?

That strongly depends on the species. The embryonic stage (egg) takes at least several days to weeks. The larval stage (free swimming larva) takes a few months to sometimes over a year. The adult life span latst from 7-10 years (average), some species can reach an age of more than 20 years.

Some salamanders dont have an external egg and larval stage (live-bearing) or there is little difference in the larvela stage compared tot the adult stage (neotene). In these species it is hard to tell the different stages.