To many, Labor Day marks the end of the summer season, even as Memorial Day marks its beginning. Many see Labor Day as their last chance to get out and take a vacation before summer is gone, and many workers get a two-week annual vacation period with Labor Day Weekend right in the middle of the two weeks off.
The lifespan of a hover fly is similar to other flies. They can  live anywhere between 15 to 30 days and it all depends on the  climate and temperature they are in.he common housefly (suborder Cyclorrhapha) generally can have a life cycle of 15 to 30 days. Four distinct stages characterize its life cycle: egg, larva, pupa, and adult.
The average lifespan of a housefly is 20-30 days. http://www.newton.dep.anl.gov/natbltn/400-499/nb453.htm. This page (in German) says 16-24 days, and that the females live longer than the males. http://de.wikipedia.org/wiki/Stubenfliege. According to this page, from 7 days to 2 months. Quote: The house fly has a complete metamorphosis with distinct egg, larva or maggot, pupal and adult stages. The house fly overwinters in either the larval or pupal stage under manure piles or in other protected locations.