I tink the problem is that until the last batch of congestion is flushed out, the toxins and waste material trying to pass through the ducts gets stuck behind it, causing more stones. It's almost like a race to get the front material out faster than new material comes in and gets stuck and is created behind it. Things like meat, dairy, refined flour and drugs make stones at an alarming rate. Anything without fiber, or contains toxins or undigestible contaminants, causes the body to dump it into the bile ducts. A vegan diet def helps a lot in preventing new material from being formed. Andreas probly just said 12 so people felt it was attainable and wouldn't get discouraged from such a long road ahead.