It all depends on your current BMI and what plan you'd go on.....you can only do SS/SS+ with BMI over 25 and losses are about a stone a month, but if you only have 2st to lose, I'm guessing you've lower BMI than that so would have to do a higher kCal program, so losses would be slower - sorry not much help, but a CDC should be along shortly to give you the low-down........