Other factors determining degree of detoxication include metabolism, tolerance, frequency of intake, fluid intake, amount of marijuana, potency of marijuana, and length of time you've been a user. If you use marijuana on rare occasions, your urine may be clean of metabolites in less than a week. There is a common and strange phenomena that occurs with chronic users. You would expect a chronic user to have the longest detection time and the smallest chance of passing. This is not always the case. A chronic user with a high tolerance will eliminate drugs quicker than an occasional user. Chronic users have tested negative after a week long binge. Lipid tissue also makes a huge difference. Skinny users not only have a faster metabolism (usually), but also lack storage for THC metabolites. Fat will cause a lag in excretion pattern, and lead to a longer detection time.
You should now be able to understand why an individuals detection time for THC is so unpredictable. Please don't post or e-mail a question "how long will it take..." This is the single most frequently asked question. Many people can't even begin to estimate a detection for their own bodys, let alone the unseen, unknown body of a lost internet explorer.