From the Interwebs
"According to some experts, CBD takes between three to four days to exit your body completely. However, as we have already told you, a variety of different factors influence the effect of substances in your body. In any case, CBD doesn't take any more than a week to leave your body altogether."
"'Why CBD might cause you to fail a drug test'
Research has found that THC can be detectable in your system for up to 30 days, but it's usually only present in heavy cannabis users after the first week. Second, there's a good chance that the CBD product you're using contains more than the .3% THC legally allowed."