Depending on the condition treated, you may be able to see initial improvement as early as after the first treatment. Typically, multiple treatment sessions are needed. As an example, a clinical study of benign pigmented lesions found that after 2 treatments, 87% of lesions had a least good response (>50% had a good response or better). [PicoWay 510(k) clearance for benign pigmented lesions (K150326)]
Results can vary a fair amount based on ink depth, tattoo colour, and skin type. While most people can expect to see 60%-90% removal, results can vary for each individual.
The Picoway® laser is the best laser on the market. Usually, it requires around half the number of treatments as other lasers on the market for similar or better results.