Please tell me how long does it take to lose weight?

One lb per week : The type of weight you lose is important. You can lose the wrong type of weight (muscle bone and water) or the right type of weight (fat) depending on your program. Healthy weight loss (mainly fat) is usually about 1lb per week, but consult your doctor to figure out what's healthy for you. Your age, sex, current weight, and any illnesses you have factor into your goals.