I havent been since july but I could make it last if i really tried to keep it away from water for about two weeks. Now granted it wouldnt be super straight like the first couple of days but it was pretty straight. To keep it that long I have to becareful not to get it wet in the shower and not keep applying alot of prodcuts. Just some serums or oils and a little jam for the edges. After the first week i would just were it in a ponytail or half up half down. I would also usually reapply the flat iron a couple of times between the two weeks.