We recommend leaving moisture masks on your hair anywhere between 15 minutes and two hours. Ultimately the exact duration will be dependent upon your hair profile and what is doable for your routine! It's great if you can allot two hours time for your moisture mask, but if this isn't possible or you find your hair has an "over-conditioned" feel to it, then reduce the amount of time. You can also make use of a cap or hair towel to lock in some gentle heat, which will increase the efficacy of the mask in less time.