When I was chelating, I did what Andy first recommended in his book (he's now moderated those recommendations for those more poisoned/sensitive). However, at that time, he hadn't. So I did the 50 mg, every 4 hours around the clock for an entire week on and then had a break for a week.

I remember the symptoms wouldn't usually start immediately, but they would increase as the round wore on and usually by day 4 I was REALLY feeling it and feeling ill at that. Very toxic indeed. But not the kind that has you going almost insane with symptoms, just really sick/toxic and tired. I could barely make it to the end of the week and sometimes had to stop a bit earlier.

Though some feel better on the round than off, so it differs. Plus you can have rounds you feel better on and other rounds you may not, because that's the nature of mercury too and how you maybe at the time, where the mercury is etc. I was also slack on vitamins/minerals and didn't take as many as I could have, nor did I take the B or C vitamins 3-4 times a day as recommended. I was a bit lazy in that regard. I didn't take flaxseed oil either, which I probably should have. Given Andy recommended 1-2 tablespoons a day.

I would go as many days as you can handle (but not over a week). E.g. if you feel ok and can make it to a week, that's fine. If you start REALLY feeling revolting after 2 days and you're struggling to keep going, you can quit at 3 days or something like that. And then just have a break about the amount of time (or longer if needed) and try again. It's not a race, it's just about getting mercury out bit by bit without compromising you too much at the sametime, which isn't easy considering it's mercury.

I think antioxidants (C and E), essential fatty acids, B vitamins and milk thistle are probably very important and taken frequently is obvoiusly required as Andy points this out. I think selenium is a good one too, but some may react to that. However, mercury competes with it, displaces it and uses it up and sometimes taking selenium can actually stir up some mercury for some people.