How long does a cotton swap drug test in the mouth test?

i need some help, i dont care if this is a stupid quesion or if i spelled something wrong i just need help, im trying ti get a new job i have a canibus card, i smoke this new job im trying to get drug test thru cotton swap in the mouth how long do i not have to smoke for me to pass? how many days do i have to be clean to pass this test to get a new job? plz help