I don't think it takes much exposure for some people. Other than getting them out with a slotted spoon to feed the chickens/frogs/finches, I don't do anything to the worms anymore. They are outside on my deck, I will need to bring them in soon because it'll be too cool/wet in Seattle. If I didn't have the frogs, I honestly think I would give up on the worms. The frogs will only eat living, moving food, and crickets were too hard for me to keep alive.