For me it was 12 weeks it can be longer depending on your job. Work out 2 times (mostly cardio and calisthenics) a day for 5 days a week. Some people are allowed weight training others are not its up to the drill sergeants. I think the biggest reason may be because of the diet. They strictly enforce 3 meals a day and you HAVE to finish everything on your tray and you are never allowed any cake. pie or any other desert.