What is the recommended usage cycle for Celre Diem, which tackles severe internal dryness?

Hello! Since I spend all day in the office exposed to the cold air conditioning, my skin feels oily on the surface, but after washing it, it feels incredibly dry and tight, as if it's tearing apart from the inside. No matter how much moisturizer I layer, it just sits on the surface without penetrating deep into my skin, so I am planning to start a treatment using Celle Diem, a highly concentrated skin booster. To effectively maintain the results of the Celle Diem treatment, which firmly replenishes moisture from deep within the skin barrier, approximately how often should I schedule my visits? I would appreciate it if those who have consistently visited Celle Diem for 3 consecutive sessions according to the schedule could share their reviews on the improvement in their inner glow. !