When the weight loss will start on scale how long to become noticeable?

Depends. It depends on how much you weight and how much you have to lose. If you weight 125 pounds and are 5 pounds overweight then you will notice changes with losing just a few. However, if you weight 250 and have 100 pounds to lose, i'm not sure it will become noticeable until you lose 10-15 pounds or more. Nonetheless don't give up, it will be noticeable!