Elavie Rituo Moisture & Radiance Effect Duration

I am considering the Elavie Rituo treatment because my severe internal dryness hasn't been resolved even after layering multiple cosmetics.

I'm curious how long the feeling of being fully hydrated deep within the skin lasts after just one treatment.

I heard that if you get Elavie Rituo at a monthly interval of three or more times, the radiance lasts for about six months. I would like to know if that is really true.

I am curious if there is absolutely no tightness even immediately after washing my face during the duration, and if there are any specific signs that appear when the effects of Elavie Rituo start to wear off.

I am taking this opportunity to achieve dewy skin at a great value, so I am carefully researching the duration of Ellavie Rituo.