The number of treatments will depend on your skin condition and expected goals and outcomes. For acne scarring, up to 4 session are needed, however with only one session of INFINI you will see results. Some areas such as the neck will also require 3-4 sessions for best results. Combining lasers and INFINI can reduce the number of treatments. Remember INFINI is RF and is aimed at treating what lies under the skin's surface. Lasers can improve skin texture, namely sun damage and pigmentation. If rejuvenation is what you are after, often 1-2 combination treatments can give good results. As for the time interval? 3-6 weeks apart. You can extend to 8 weeks if needed.regardsDr Davin Lim Laser DermatologistBRISBANE, Australia.