How long after mating do house flies lay eggs?

House flies typically lay eggs about 24 to 48 hours after mating. The female can produce several batches of eggs, depositing around 100 to 150 eggs at a time. These eggs are usually laid in decaying organic matter, which provides nourishment for the larvae once they hatch. The entire life cycle from egg to adult can be completed in as little as 7 to 10 days under optimal conditions.