As with all ingestible THC, it depends on the dosage. If you are only consuming a small amount in rare instances, it will likely last less than a week. However, due to metabolism and fat content ranging from person to person, a safe bet is to have a window of at least 35 days before taking a drug test. If you get drug tested regularly, this product may not be for you. Use your best judgment when making the decision whether or not Fizzy is right for you.