Thats what the side of box said, 10 days. I considered that 10 days was a relatively short period of time and I needed to cleanse the body of deadly toxins. So for the past 10 days I cleansed, and it made me feel as though I was sobering up from a 6 week drunk. I didn't lose weight or have some out of body experience, just a 10 day headache, some acid flash backs, and the shakes. Tomorrow I will start reintroducing toxins during the BHCX rally, maybe with a flask of Stranahans.