How many days does it take for the yellow swelling and aching sensation under my chin to go down after getting Ultherapy?

My jawline and neck feel stiff, and when I press on them slightly, there is lingering pain like a bruise.

There isn't any visible bruising, but the area under my chin is slightly swollen, so it feels like the line actually looks thicker, which is a bit embarrassing.

The hospital says this is a natural process caused by ultrasound thermal energy penetrating deep layers, but usually on how many days does the swelling or contouring become noticeably improved?