There is no formula for how much Iodine displaces all of any substance in X amount of days. I'm afraid it isn't textbook like that, we have experimented with our own doses to find what works for us. After 10 months, and at higher doses, I'm still detoxing but the worst of it is over.
Believe me, I asked similar questions as you in the worst of my detox, and no one could answer it. It's subjective to your body, its toxin load, and personal physiology. But you will know when you start to feel better.
I'm not sure if you are asking should you take elemental at 5g, but if you are asking that I say no way. I wouldn't go much higher than 250 a day with elemental. If you want to try high doses, that's when you add SSKI .