I'm so glad this question was asked because this is one of the reasons I'm here: to help those in need of answers.
First, disregard anything the DUmmies may tell you as they are too stoned to answer correctly.
Now on to the question at hand. No one can tell you with 100% certainty how long it will stay in your system. With that in mind, your main question should be if you, personally, will be able to pass a drug test. Thankfully I can give you some hints on that one.
If you can't find the capitalization key on your keyboard, you probably can't pass a drug test.
If you constantly use a period instead of a comma, you probably can't pass a drug test.
If you have to ask a question about drug tests at a website full of drugged out lunatics, you probably can't pass a drug test.
Hope the above was helpful. Shouldn't you be making some fellow a sandwich?