How long does the double chin effect of Onda Lifting usually last?

How about Onda Lifting for double chin and jawline management?

I am interested because I heard that Onda is less painful than other procedures.

Is there a trial effect after receiving it once?

I would also like to know if the results tend to last for several months or more after just one session.

For those who have tried it, please share your satisfaction level or how long the effects last.