Well to me personally, I think it is pretty disgusting and very unsanitary to wear a skin piece for that long. I would not even like to wear lace that long. The material is not porous, meaning air and water do not escape. So all the sweat and bacteria is going to be trapped there for weeks. I am not really sure how anyone can wear a skin unit that long and say they have no problems. I have very dry scalp and do not sweat all that much, and I even think i would have a problem after all that time. Its like taking saran wrap and wraping it around ur scalp and leaving it there for weeks lol