I am not sure how much time it takes, but likely not long.  My own personal experience was that I had a glass container of about 8 ounces of Utopia's silver sitting out (I keep anywhere from 1 to 6 gallons on hand to use personally and give to friends and the locals) and I had used an eyedropper to put some 50/50 water and H202 in my ears.  I completely emptied the dropper into my ears and then used it to draw up some of the colloidal silver to also use in my ears.  Some time later - not sure how long, maybe a few hours - I noticed the bottle on the kitchen counter contained only clear liquid.  I thought maybe Luella had returned the contents to the gallon or 5 gallon container for some reason and was in the process of rinsing out the bottle for something else, perhaps colloidal gold (I keep a gallon or so of that around too). But I was wrong - just the contact with whatever small amount of H2O2 from dipping the dropper in had turned the normally dark amber tea colored liquid (that is what you get from ultra small particle 20 ppm true colloidal silver, unlike ionic silver) completely clear.  I saw no residue or white cloudy material at all, though it is possible that there might have been some initial cloudiness that later cleared.