Most people will do well to lose just under 1-lb of body fat per week. Very overweight people can lose several pounds per week. At about 1-lb per week of fat loss that is 50+/- pounds of fat loss per year. That will change your life! If you have less than that to lose then it will take less than a year. If you have more than 50 pounds to lose then it will take longer. Realize that change is hard and only about 1% of the people out there can just buy a diet book, follow it, and get amazing results. You need a coach to support you, help you problem solve, and hold you accountable.