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What is their life cycle?
Houseflies go through 4 stages of development: egg, larva, pupa and adult. The entire life cycle can be completed in 7-10 days under ideal conditions. Adult females can lay as many as 2,700 eggs in 30 days but more commonly lay 350-900 in 5 or 6 different batches. The eggs which are laid singly but often appear in clusters hatch in 6 to 24 hours. The maggot remains in the breeding media for 4-10 days, feeding and growing. In wet breeding areas, full grown larvae climb to the surface or sides of the breeding media before pupating. There have been cases of the larva crawling a distance of 150 ft. from the breeding source in order to pupate. The pupal stage lasts 3-6 days. The adult female is ready to lay eggs 2 2 days after emergence and continues to lay eggs for about one month. Adult flies live from 30-60 days during warmer months. In Northern areas, some adults may survive indoors for several months. It appears that flies continue to breed all year in low numbers in heated buildings such as dirty restaurants or incinerator rooms. In the spring these flies disperse to other buildings and increase in numbers rapidly.
I've heard anywhere from 24 to 48 hours, but I'd like to have an exact answer myself.