Does it really give me 72 hours hydration? How do you even measure that? I really don't know. What I know is how I feel about the mask. I can see how dry skin peeps will love this as it is one of those mask that leaves a super sticky residue. Good news is that the sticky feeling does go away after a few minutes, leaving the skin feeling thoroughly hydrated from the inside. After using this mask, I didn't have the need to put on a moisturiser to complete my skincare routine. After 3 days, even with a flu that makes me rub my nose 3000 times a day, my skin felt fine, not overly dry but of course with the daily cleansing, I reach out for my regular skincare to moisturise my skin. In no way this is a product that you can use once and never needing to use a moisturiser for the next 3 days but I guess it does help in keeping your skin feeling less dry on normal days. Overall, I do like this sheet mask. It's thin, sticks on skin well, truly hydrates my skin, and freaking