Well, getting a six pack isn't easy and you need to really make an effort. If you already have a low body fat, you might be able to train on your abs and see the affects straight away. But you need a low body fat, so you better start doing some Cardio exercise to get rid of excess fat that is covering your Abs. I suggest trying a Gym membership and then you will be able to use machines that will exercise your Abs to a high level. By doing that, you will see the effects of how much you have worked. It depends on how intense you go though, and genetics will also have a part to play, that will be a factor on how fast you gain your muscle. It took me only about four months or so to notice mine, but I started off with a low body fat, so it didn't seem to require as much work. Good luck!