No one can say for sure at 75 days but I would be surprised if you didn't. Some chronic users take a few days to get clean, some a month, some even 2 months. 75 to get clean and even 90 days is possible but very rare. Usually these (the 75-90 day) people are overweight, engage in very little physical activity, or smoke insane amounts of weed. If you want to be sure, get a home test and test the first void of the day.