For colloidal silver to work effectively and how long it will take to work on whatever is being used, depends on the method or way it is used. Colloidal silver is a mainly liquid base solution, it can be sprayed, taken orally, applied as a gel on the skin, or even inject it.
Colloidal silver works on the skin faster than other methods, for example, bacteria because it has wide antibacterial effects when it is used on wounds. Meanwhile, it can take a day to 6 days to work effectively as well.
Another thing to know about colloidal silver to make it effective is that it should not be used with antibiotic drugs in order to work effectively. Colloidal Silver is more like a miracle in a jar for anyone with adequate usage.