Lifting effect duration: ① cosmetic acupuncture: 3–6 months (with regular maintenance), ② high-frequency RF: 6–12 months, ③ needle RF/HIFU: 1–2 years, ④ thread lifting: 1–2 years (threads dissolve, collagen remains). Factors affecting duration: ① age (older skin: shorter duration), ② skin care, ③ lifestyle (smoking/sun reduces duration), ④ herbal medicine support. Maintenance treatments every 6 months extend results significantly.