How many flies are birthed at one time?

Flies are prodigious breeders,In warm weather,the life cycle from egg through maggot to adult lasts just eight to twelve days. Theoretically,two flies mating in April could produce 191,010,000,000,000,000,000 descendants by August. Enough to cover the earth in a blanket of horridness 47 feet deep.

They lay dozens of eggs,sometimes more somtimes less,depending on the species.