I can't remember how long it took for the symptoms to disappear, I just remember realising a few years later that I'd no flare ups since that same point in my life, then double checking dates to see if there really was a correlation!
My doctor insists I'm not dairy intolerant despite the evidence of what happened when I quit/accidentally went back, (I also was due surgery on my right toe joint for arthritis, I never got round to booking it and the arthritis cleared up. Doc says this isn't possible, even when I bend my toe around painlessly in front of him while he holds the Xrays showing I did previously need surgery!)
I've heard other vegans say it took around six weeks when they noticed their various health improvements/condition reversals - although some athletes have shown there's benefits after 12 hours (The Game Changers, Netflix)
Good luck everyone who can try it and maybe never have to worry about HS again,😀
There's loads of new improved dairy free cheeses, milks, chocs etc so no need to miss out too much!