I thought I was going to have a full 10 days prior to the UA but I actually only had about 6 days. I followed through with the directions exactly including adding more fiber and protein to my diet (not that difficult and made me feel better through the detoxing process) and by the 6th day before I took the final drink, I was experimenting negative. I smoked everyday for the last year and half and stopped smoking about 25 days before the experimentation. The program works, even if you don’t complete it in its entirety. I would trust it for any UA in the future!