That really depends on just how heavy you are. 18lbs on a person who needs to lose 25 lbs to get to a healthy weight or even 50 lbs, is a large PERCENTAGE of their weight. But when we start out at a higher weight, like in my case a MUCH higer weight, it can take quite a bit longer.
I would say it probably took about 35 lbs or so til I saw a change. And it was in my clothing first. If it weren't for the clothes it would have taken even longer to show up. Hang in there. I promise you, you WILL notice a change - in your clothing, your body, your face, your skin, your energy level, your EVERYTHING!!! And before you know it - others will notice it too. Just keep at it. Those rewards are just around the corner for you, and boy when they get here, they are FUN and oh so enjoyable!