The cooling sensation comes from menthol and typically lasts a few minutes up to about 15–20 minutes after application, depending on skin temperature and how much cream you use. It is a surface-level sensory effect, not a sign that the product is "working" medically — the skin-softening benefit from lanolin and sunflower oil builds up with consistent use. The cream is formulated for regular, even daily, evening use. There is no stated limit on duration of use in the product information; treat it like any other foot-care balm. If you find the cooling sensation too intense, apply a thinner layer or use it every other evening until you get used to it. Store the tube at room temperature, cap tightly closed, and keep it out of direct sunlight — heat can make the menthol feel stronger on application. As with any cosmetic, if irritation develops with repeated use, discontinue and consult a specialist if needed.