Rat patrol, epilogue

Ever since Jerry's visit, all has been quiet in our basement. No new droppings. The rat traps are untouched. Every morning I creep into the basement with the flashlight and do a patrol of all the traps. The peanut butter is uneaten, the jaw of each trap still wide open and waiting.

I think we're done with the rat story.

My question now is this: How long do I leave the peanut butter-smeared traps baited and waiting before I start getting a new problem--ants?