Let's take an overall look at effectiveness.
When silver comes into contact with a pathogen, it kills it.
The concentration of silver in your brew is measured in PPM.
Some important questions to understand are How many million parts are there in the body? and What concentration of silver is needed in order to eliminate pathogens?
To put this into perspective, let's look at a pathogen that is living in the blood stream. Depending on your body mass you can have up to 7 liters of blood. Let's say you brew a batch that has 10 PPM silver in it. If there are no conversions due to body processes when you take 30 ml (1 ounce) of the 10 PPM silver and dilute it in 7 liters of blood, you end up with a concentration of about 0.04 PPM.
If the pathogen you are trying to eliminate requires 0.16 PPM, your efforts by taking 30 ml will fall short.
The other side to this is that you can only take so much before it becomes toxic or displays adverse side effects (like turning your skin blue).
There has been some effort in trying to define the upper limit. This site has a calculator that addresses safe amounts for daily, short term, and lifetime totals.
A common approach, once you have become ill, is to look at the short term amount and double it for an even shorter term. The define short term as 10 days. Actually they define it as 10 days per month, but let's just look at a 10 day limit.
CS has a specific gravity a little more than water, but with water there are 20 drops per milliliter. Once you figure out your weight and the PPM of your brew you can divide the number of drops listed by 20 to come up with ml. 30 ml is about 1 ounce.
After running the calculation for short term use, you can consider doubling it for a few days, then backing off.
Since this is supposed to be a "safe" amount, you may not be concerned what levels are needed to kill pathogens, and simply hit them with a maximum amount and see what happens. If the problem does not go away, try something else, or wait a week or so and try a maximum amount again.
Some people take a little every day to guard against illness. Others only take it when they are ill, or when someone in the house becomes ill. You will have to decide what fits you the best.