how long does pot take to get out of your system im 6ft2 200lbs heavy smoker few times a day everyday for a few years quite 3 weeks ago?

Same as everyone else. About 28-30 days for urine. If it's a urine test, after about 27 days it MIGHT come up inconclusive in which you may need to re-test. Blood test, I think it's 6 months, hair I believe a year. Mouth swab, usually the same day if you swish with some strong mouthwash right before the test. There are other "cheats" to "beat" the tests, but I suggest you google it. I don't personally smoke, I just have friends who do and have watched them try every tactic in the book to beat the tests. I just don't know if any of them work, lol.

If you are really a heavy smoker it can take over a month. My buddy was busted when we were minors he was out of scale even after two months...Try boosting your metabolism with exercise, perhaps some green tea, hydrate like there's no tomorrow, try detox/cleansing this might help but I'm not sure as I never tried it...

About 30 days like everyone else.

Could be 10 days, but it could also be a month or more.