ok, ROUGH guess, haven't kept records,he,he. I would say they take about three weeks since they're born to when they're large enough to spin a coccoon. Then another two weeks in coccoon and two more weeks for the eggs to hatch. Don't give up on the medium where the eggs are laid if it seems that nothing's happening. Remember the more moths are in there, the better chance of you getting a new batch of worms. Just set the container apart when the moths are there (they die a few days after emerging from the coccon), remove the dead moths and keep the container sealed with a fine wire mesh. I keep another container with the worms I'm using for feeders. That way I don't have to go poking around looking for left worms to feed my cham and not leaving enough for a new batch. I'm glad to be of help, let me know how it goes! L~