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Roach spray usually starts working almost immediately on contact—within seconds to a few minutes. However, if it's a residual spray designed to keep killing over time, it can take hours or even days to fully affect roaches that come into contact with treated surfaces. For larger infestations, it may take at least a week to see a noticeable drop in activity, since not all roaches are exposed at once.

Common house roaches, typically American cockroaches or Periplaneta americana, usually live for around one year. The male American cockroaches survive for about one year, although the females may live up to 700 days. That’s because the reproductive cycle alone can last around 600 days for this type of cockroach.

Yes, sleeping in your house after receiving a pest control application should be no issue, but the best course of action is to wait for the treatment to dry completely. The drying process takes a few hours. Some treatments, such as fumigation, may require a longer drying time, so be sure to ask the technician what drying time you can expect.

Getting roaches to completely go away will take a lot of effort, and they hardly ever go away on their own. You will likely need a combination of home treatments, like roach sprays and traps, and regular visits from an exterminator, to control an infestation. It can take awhile for these treatments to start working, and you’ll need to stay on top of replacing old traps and having additional extermination services, plus keeping your home clean and decluttered, to deter roaches.