Excellent product. I have bought it more than once and it has worked every single time, no matter in which room I have used the bait station. The trick with it (and that is where some people fail to use the product to its full potential) is that the bait needs to be placed AT THE PATH OF THE ANTS. You cannot just place it anywhere and expect them to come to it. No, you need to see from where their path leads to where and place the bait in the middle. That way you ensure that all the ants (those moving away from the nest and those going to the nest with whatever it is that they carry) will have walked through the bait. I say it take about 2-3 weeks for all the ants to disappear. The ants begin lessening in number from day 2-3 after placing the bait in their path, but it takes another good 15-20 days for them to stop completely. I think this is an excellent turn-around time and it would seem that the bait also keeps the ants away for at least 4-5 months after first placing the bait in their way (I think it helps that I do not throw the bait away for at least 6-7 months - i.e. there is a bait in that path, even if they come back to explore their old roads). Overall, a highly recommended product - if it is used correctly, it ought to work every time. It has for me, so far, and I do not see any reason, touch wood, that it should stop now. I will continue using it - hope you will too!