In most cases, the pest controller applies an aerosol spray that would require no one being in that room for 2 hours. Inspections will also take place to identify the cause of the issue. Surface sprays are also very good as it continues to work so long as it's not mopped away..
Q: HOW LONG DO THEY LIVE?
The average lifespan of a housefly is between 20-25 days, but they can live up to a month. After maggots appear in a home, adult flies usually appear 1 to 2 weeks later. The flies may continue to emerge for 1 to 3 weeks.