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Just so, how long does it take for an exterminator to get rid of roaches?
Generally speaking, most infestations take about two weeks to terminate. A heavy infestation may take up to eight weeks. These timelines are of course for professional exterminators. DIY cockroach removal will take much longer if at all it is successful.
Subsequently, question is, do roaches come out after extermination?
Roaches may be more active after treatment, DO NOT SPRAY, your technician installed baits and household sprays will contaminate them. Expect to see more roaches for two weeks. As roaches are affected by the treatment they will come out in the daytime.
Getting rid of roaches involves more than just spraying an insecticide or putting down a bait or dust. Roaches get into everything, multiply rapidly, and can survive for several months without food and up to two weeks without water. It can take anywhere from 3 weeks to 6 months to completely eliminate roaches.