The duration of stain treatment may vary depending on the type of stain, its depth, skin type and the treatment method used. Generally, professional stain treatments such as laser treatment, chemical peels or exosomes can be completed in 3 to 6 sessions. However, in some cases, more sessions may be required. Depending on the treatment method used, it is usually necessary to wait a few weeks between each session. This can extend the total treatment time to several months. It is important to create a personalized treatment plan to achieve the best results.