How long does it take to see whitening effects?

I've always been very interested in skin whitening, so I recently ordered a whitening cream.

The price wasn't much different from regular cream, so I ordered it just to take a chance, and I think I've been using it for about 3 or 4 days now.

How long does it take to see whitening effects?

I need to see results before I decide whether to buy another one, you know.

Usually, when using whitening products like ampoules or creams, does it take some time for the results to become noticeable?

I want to hear people around me say my skin has gotten whiter.