Could use some advice for passing a DT

Ok here is the story, I am on 12 month probation (first time offense, judge was fucked up), been clean for about 49 days now (since 10/15) passed my first drug (11/14) only 28 days after i smoked naturally. My second DT (12/18) is 13 days away, which gave me over 30 days to pass it naturally. (i havent smoked)

My question is after i take my second DT how long do you guys think it will take me to be clean for the next one ?

Some info on myself: Weight: 165 Height: 6'0ft Age: 20

Keep in mind that when i do smoke it will only be one time and probably not that much, but it will be dank, and after i will be working out at least 3 times a week, drinking shit ton of water, and taking vitiamns.

My estimate is i should be clean in at least 20-25 days as long as i give myself at least 20-25 days to get clean i feel i should pass the DT no problem. Its really weird though i'm suppose to have dt's every 3 weeks but its going to be over a month since i have to take my next one so i dont know how strict my court/PO is taking this once every 3 week bit.

Thanks for the advice and please put some reasoning behind your answers.

Forgot to say i smoked for like 2 yrs 3 times a day before i got caught but obviously after the first 28 days of not smoking i was clean. Just wanted to give you guys more info.

careful if you're on probation they could call you in for a pop test. they've done it to me and many others i know

You are going to have to pickup some cheap test strips and check yourself.Its the only way to know.

Nothing can give you peice of mind like not smoking at all but I have passed several tests.

Im the same height and weight. Im skinny, with a normal amount of body fat, say 10%.. I have passed 3 tests smoking kind bud for over a month everyday, heavily. On the first I passed in 28 days, straight up. The second was 18 days, straight up. The third was 12 days, and I ws scared as fuck, but I passed straight up. The only thing I did differently on the 3rd was drink 1 liter of water and a 12oz pepsi. All tests I had been previously smoking for 30 days straight.

Hope this helps.

Also, sorry for another post. But I have created one called "Hair Testing - I have researched" I would like to see some feedback from you all. Thanks a bunch.

single use is nothing to worry about. that will be out of your system within a week, tops, if you are indeed clean before you smoke.
check this out:

Erowid Experience Vaults: Cannabis Urine Testing - THC Detection Times in Occasional Smoker - 37341