About a month or two. But for the record, it didn't give me breakouts so I am really thankful for that. Also, I think the effectivity will depend upon your skin since we all have different skin traits and textures. Nevertheless, I wish you good luck in trying the acne control kit of Flawless. These products really helped me improved my skin. On the side note, I suggest you to experience also their facials for acne especially their Acne Control Advanced Facial. I know their products and their services are a bit pricey but you can try at least two facial sessions just to help you along the process of combating your acne. You can also ask for a little consultation with Flawless dermatologists, which I think is free (not sure).