People report that it can be one or two days before they start to see a noticeable difference in the level of pests. The exact time frame of how effective the initial treatment can vary on a few elements.
The time frame varies as a result of the different chemical solutions used, the environment of your property, the number of pests, and where the spray was applied. After the initial treatment, it may seem that it is not working, and the pests will be more active.
This is a good sign as a good pesticide is one that is shared insect to insect. Pests will transport the pesticide to either a colony or other pests and fix the root problem.