How often should I use this product?

I have this product and I want to use it, but I don't know how often I should do it. The Clinique website says twice a day (which I won't do, I'll just use it at night at most), but it contains salicylic acid and I don't want to overexfoliate my skin. On the other hand, the WIMJ website says it doesn't have much exfoliation power, so maybe it's OK to use it everyday.

I'm just using a cleanser, moisturizer and sunscreen right now, so this would be the only active ingredient for my acne-prone skin.

Thanks so much.