Many people don’t realize how little water mosquitoes need. It only takes about a bottle cap of water for a female mosquito to lay eggs and each time she deposits her eggs she drops around 300. Because of this puddles and birdbaths aren’t the only areas to worry about. You should also be aware of smaller spaces like overturned toys or trash cans for these insects to lay their eggs. During the mosquito life cycle, mosquitoes can take as little as four days to go from egg, larva, pupa, and then to adult but typically take on average a week and a half to reach adulthood.