I left it on for about 30 mins because I layered it on very thick! I then peeled it off like it says to and was surprised how soft and hydrated my skin felt! It definately looked refined! I do love this product as lost refining masks strip the skin of natural oils and leave it feeling dry but this one didn't! The only thing I dont like about this is that is comes in the sachets and you do not need that much product. But the bowl and spatula you get in the box is great and makes it mess free when applying the mask! I love everything in the Medik8 brand! Its all so amazing, my skin has not looked better in years!