I did davina body buff DVD 5 times a week over a 5 week period, I swam 4 mornings and had a strict diet I lost 12lb then got preggers and it all went out window. It was hard going I prob won't get to do that much exercise with 2 kids.
depends where you are to start with. if you are several stone overweight then you could lose 2 stone - i did. but if you are only a stone over then likely as not you will lose around a half to one pound a week. i have done mine with slimming world good luck.