ALL of the die-off allowed to finsh. That's what I consider cured. Usually takes weeks, not days. vIf you are going to have die-off when you put it in your tank, then it ain't cured. I have nothing against Life Oceanic, they're good people, but the rock just is'nt what I would call fully cured or primo. At least not from what I saw, and I was there about 3 weeks ago with a friend.