The products will start to take effect immediately once applied in and around your home, however, they can take varying time frames to reach full effectiveness dependent upon the pest being treated, and the product used to do so. Our service technician will advise you on the time frames for your individual property on the day of treatment. Occasionally and dependent upon the severity of the infestation a follow-up or series of follow-up treatments may be required, our technician will advise on the day of the treatment.