It usually takes 1 day for the professional exterminator to do the job. Most products should protect against re-infestation for up to 5 years, but once you have found a termite infestation, it is a good idea to have your home inspected yearly to be sure they are not re-colonizing. If you need termite inspection, call Attack Pest Management to schedule an appointment. We service San Marino & South Pasadena areas.