How long does it tale k9 advantix to start working?

I put it on my 2 year old golden retriever 2 days ago right after walking some tall grass and finding a tick on me. I didnt find any ticks on her, but I put k9 advantix on her just to be safe (also, it's been a bit more than a month since her last application). How long does it take to start working (I want to take her for another walk asap).