How does a maggot turn in to a fly
Answers. Best Answer: A lot of it depends on the temperature and the food supply available. Typically, a fly life cycle goes like this: 8-20 hours after the eggs are laid, they hatch into maggots. Four to ten days later, the maggots turn into pupae.Three to six days after that, the pupae start to emerge as adult flies, which will live for about 15-20 days.So from maggot to pupa to fly, maybe seven to sixteen days, depending on the conditions.Source(s):est Answer: A lot of it depends on the temperature and the food supply available. Typically, a fly life cycle goes like this: 8-20 hours after the eggs are laid, they hatch into maggots.