How long til thc is out of my system?

I’m a 5ft 9’ male, weigh 155 lbs. I exercise a few times a day (weights, cardio, sauna) and have a pretty lean physique. I am expecting a drug test sometime next weekend. I smoked everyday for 3 weeks coming off a month long T break. I only use cartridges and the last time I smoked was last week. So I’m 7 days clean so far and have been drinking GALLONS of water, Gatorade etc just trying to flush my system. Any tips for people who have been in a similar boat? I’d appreciate it!!!