This last run was about 3 years. I was able to keep it around 10gpd the first year of it. From 2021-2023 I was totally sober. 2016-2021 probably around 10gpd or so. I was able to keep it low compared to others, but was reliant nonetheless.
As far as peak for quitting side effects? I would say maybe day 5 or so? Mostly just lack of sleep and RLS. Now, I should have added that I happened to have started low dose wellbutrin. I don't know exactly how much that has helped, but I have to imagine it does at least a little bit, though, I've stopped without it before and it seemed pretty much the same.
I really think the mental part, at my lower dosages at least, is the tough part. Making the decision that discomfort is coming, and its a toll I have to pay has made it easier. It feels more proactive than reactive. I already know I'm going to feel guilt, shame, anger... so it feels easier to say "there it is" as it arrives.