There is no single timetable for skincare. A fixed number of days is not a useful promise without evidence for the finished product.
Ask a smaller question first
Does the product fit the part of the day you bought it for? Are its directions practical? Does it agree with you? Those questions help you decide whether something belongs in your routine without expecting a transformation.
You do not need to keep using a product that irritates you in order to complete an imaginary trial period. Stop if irritation occurs.
Keep your observations simple
Write down when you opened it and how often you used it. Avoid changing several steps at once. If you compare photographs for your own reference, use similar light and avoid filters; even then, a photograph does not isolate the effect of a single formula.
A bottle is not a deadline
We do not attach a seven-day or thirty-day result promise to Ozera formulas. Ingredient familiarity is not a substitute for finished-product evidence.
If a persistent skin concern is the reason you are shopping, a qualified healthcare professional can help you decide whether a cosmetic is the appropriate next step.
Further reading: FDA: wrinkle treatments and other anti-aging products
Photography: Dolunay laylay / Unsplash. Editorial photograph.