As with every medical treatment, results don't come overnight...they take time and commitment. Most people feel that their skin is cleaner and refreshed in just a few days. If you use your treatment as advised, visible improvement is usually seen after 3-4 weeks with significant changes at 8-12 weeks.
You can help increase the rate of improvement in your acne by taking other acne prevention measures i.e. using the right cosmetics, (oil-free makeup and sunscreen), improving your diet (reduce consumption of dairy, sugar, and high-glycemic foods), getting enough sleep, reducing stress etc. It's important to track your skin's progress in addition to any changes to your routine or lifestyle to understand the impacts on your skin.