I got a 0.4oz sample size from Birchbox and it lasted me about a month and half. I was really happy about how long such little product lasted because it CLEARED MY ACNE. My cousins came from abroad and met me with the worst skin. My scars and hyper pigmentation were dark and so pronounced, I wore concealer as foundation every day. But after two weeks I was so impressed with the improvements on my skin, that I stopped wearing foundation. I suspect the secret is in the superior exfoliation you get with the mask. After spreading it on and leaving it for 15 minutes, I'd pat water and scrub scrub scrub until it began to faintly sting. Then I'd wash the product off and emerge looking like a new woman. Now, while the mask is a bit on the expensive side, the product is completely worth it. My skin loved it!