It is not uncommon for our technicians to recommend a few monthly follow-ups for 2-3 months to make sure that we achieve eradication. Since the bait stations are a food source for the mice, if the bait station has bait inside, it will continue to work. Once the bait is consumed, the bait station is no longer working for you. In severe infestations, our technician may recommend a follow-up in two weeks, but once a month should be more than enough to keep the baits replenished and working for you. Once we notice that the bait is no longer being consumed, or reduced feedings is observed, we can switch your service frequency to bi-monthly (every other month) or quarterly (every three months). If we should see increase again, we would recommend that you go back to more frequent service.