What is the typical cycle of a Shrink Universe in months?

My jawline looked too dull and wide, so about two months ago, I received a full 400-shot ultrasound treatment, which is said to be the most cost-effective option. I liked that it uses a pen-type applicator that rolls over the area, so it seemed to penetrate thoroughly without leaving any gaps under my chin. After a month, my jawline really tightened up, and I felt it was totally worth the money. I am completely satisfied that my face shape could become this smooth without any downtime, allowing me to resume my daily life immediately.

However, I feel like that initial tightness is slowly loosening a bit. Is it just my imagination? I am wondering if the standard practice is to revisit the clinic every few months for Shurink Universe treatments to maintain this firmness. I would also like to know if the effects last longer if I continue getting treatments every 3 to 4 months. I really liked my first treatment, so I want to make sure to get Shurink Universe treatments regularly!