How many sessions of leg lifting would be appropriate to get rid of a double chin and jowls?

As I get older, I can noticeably see my facial contours sagging and the skin under my chin drooping, so I am looking into lifting procedures. I have become interested in Onda Lifting, which is said to be effective for fat reduction and improving elasticity while being minimally painful.

Although skin conditions vary from person to person, I am curious about the average number of leg lifting sessions required to achieve a satisfactory line.

I would like to know if noticeable changes can be seen after just one session, or if I need to receive at least three sessions regularly—the effective number for On-Da Lifting—to refine the lines. If the sagging is not severe, how long should I wait between the first procedure and the next On-Da Lifting session to maximize the results?

It would be of great help in making my decision if those who have undergone the procedure could share their valuable experiences regarding the appropriate number of On-Da Lifting sessions and the duration of the results.