How long does the lifting effect usually last when receiving treatment with domestic equipment?

I am currently looking into various options for a lifting procedure to smooth out the uneven skin around my double chin and sagging jowls.

The unit price per shot for imported equipment is quite high, which is a bit of a burden, so I keep finding myself drawn to domestic laser devices that offer excellent value for money. If anyone has received treatment on their jawline or cheeks using domestic firming devices, could you honestly tell me approximately how long the lifting effects actually last?

I would like to hear about your personal experiences regarding whether the skin quickly sags back to its original state after 2 to 3 months, or if the firmness is maintained smoothly for at least half a year. Since I am taking the time to get this treatment, I want to be aware of how long the results last before planning my lifting procedure.