How long after quitting cannabis are you free from CHS?

Long story short, Been dealing with CHS for about 11 years. Thought I could mediate my intake, but it always creeps back up, I got my episodes down to once every 18-24 months by changing lifestyle, and using amitriptyline + Omeprazole. I would get to a point where I was confident, then it would come back at the worst possible moments. My longest episode to date was 4 weeks. I was contemplating suicide. So I have quit. Completely and too my surprise - far easier than cutting down. My main triggers were alcohol, Heavy exercise, eating at restaurants and stress/anxiety.
It has been 3 weeks and two days. I'm going to see a band next week and was contemplating having a beer, but I'm pretty sure I probably haven't completely detoxed yet. I googled how long it takes to detox and its not a one size fits all sort of thing. I was going to buy a piss test online to check. If I am detoxed is there any risk of it hitting me again.

Also thank you to everyone on here that has posted their experience in a lot more detail than I have provided. This place has been the best source of information and extremely useful in being able to self diagnose. My doctor told me it was CVS, which shares the symptoms almost exactly and put me on anti depressants, that I now also need to get myself off. one step at time I guess.

Peace and strength to all.