How light can your skin get?

Over the years your skin becomes darker due to many environmental factors, such as sun exposure and harmful pollutants. For those people wanting to have a fairer skin how light can your skin get?  The skin colour when you were younger is a good indicator of the maximum possible extent your skin can lighten. Your inner arm or your chest can be your guide why? It is because these are the skin that weren't exposed.   

The complexion you want to achieve depends :1) how your skin respond to whitening products such as lotion, creams and soaps, 2) your skin tone category (the darker your skin the longer it takes) and 3) how frequent your skin is exposed to the sun.   Each individual skin varies, some can see results in a matter of days, others take weeks or even months, just remember that it takes a lot of patience and time to improve your skin appearance, Skin whitening products don't perform magic that can happen instantly.  Just remember that once your skin got lighter, you still need to continuously use the whitening products to maintain it.