The frequency with which you should undergo this chemical peel will be determined by the type of peel you choose, severity of your skin condition and your desired outcomes.
For minor chemical peel, it is recommended to do it every two to five weeks.
For mild chemical peel, it is recommended to do it every two to three  months depending on your on the sensitivity of your skin type.
Unless it is absolutely required,  deep chemical peel should only be the last resort after all options are exhausted. As deep chemical peel can cause potential skin issues, it is not always recommended. Check with your skin doctor before making any decisions.