The lifespan of a fly varies by species and environmental conditions, but here are the typical ranges:

• House flies generally live about 15 to 30 days, with some sources noting 15 to 25 days on average, and under optimal conditions they can survive up to 2 months. Their life cycle includes four stages: egg, larva, pupa, and adult, and they can reproduce multiple times during their lifespan

• Fruit flies tend to live longer than house flies, typically about 40 to 50 days. They also reproduce quickly, with one female capable of producing hundreds of offspring during that time

• Other fly species vary: gnats may live from 7 to 30 days depending on species, and cluster flies can survive several months, especially if they overwinter indoors

Environmental factors such as temperature, food availability, and living conditions significantly affect fly lifespan. Warmer temperatures generally speed up development and can extend adult life, while lack of food can shorten it to just a few days

. In summary, a typical house fly lives about 2 to 4 weeks, fruit flies live around 1 to 1.5 months, and some flies can live longer depending on species and conditions.