"THC can stay in you blood stream for about 5-7 months"
Someone is being pessimistic. First, are you smoking swag or kine. Second, are you a pothead or just an occasional smoker. Third, how fat are you. Fourth, how active are you.
Depending on how you answer it will take 2-45 days. In some cases, potheads can still have THC after 90 days of them quitting.