How many ultrasound lifting sessions are usually recommended?

Since the beginning of this year, I have felt a significant drop in overall facial elasticity and a dulling of my jawline, so I am currently looking into ultrasound lifting procedures.
I’ve heard that lifting devices like Shurink or Ulthera really lift the skin from deep within, so I’d like to try them out myself.
However, I heard that the effects of a lifting procedure do not last a lifetime after just one treatment, but require consistent, periodic maintenance.
I am curious how many ultrasound lifting procedures you generally recommend getting per year to maintain a definite V-line effect.
Please share your expert tips on the recommended number of sessions and treatment intervals from those of you who regularly maintain your skin with lifting procedures at Maypure!