When will I see results with Botox?

I just came from getting botox on my forehead. Ok, so when will I see results? I've had this deep wrinkle from a habit of squinting my eyes when i dont even have a problem to see. That wrinkle has been the reason why I hate looking at myself and finally today I got botox on it. I heard the results are not the same day, but how long will it be? I am so anxious!