I agree with Dr. Rand, that there is no standard definition of extended (or any) tummy tuck. There are so many different available techniques, that many surgeons, myself included, adapt the operation to achieve the best result for each patient. This means, in my opinion, the shortest possible scar, the lowest possible scar, the narrowest waist, the most natural belly button, and the sexiest contour, with removal of enough skin to flatten the belly permanently, but not too much which leaves the scar under tension, setting up a situation which may lead to widening of the scar, or even wound separation. So, the answer to your question is, I would examine you and extend the scar only as long as absolutely needed to remove the loose skin.