Only a very small fraction of the congestion comes from the Gallbladder. You're right in the sense that it is very small, which limits it's storage capacity.
Almost all of the congestion comes from the miles of ducts throughout the liver's biliary tree. Every time you flush, the gallbladder refills, with stones moving forward, from the liver and is pushed out, using the gallbladder's contraction mechanism.
The liver can easily store up to 10,000 pin head sized stones throughout it's duct network, which is why it can take a very long time to fully clean it out. When I really analyzed my symptoms and dated back to when they started, I realized that liver congestion had started at a very young age, so this process of congestion has been escalating for over twenty years in most people.
The stones literally become embedded into the liver tissue, causing some of the congestion to take several attempts to push and loosen up the material before it will come out. I went ten flushes once without one stone coming out, and then the next flush yielded a batch of stones that were an inch and a half in diameter.
When there are five thousand plus stones embedded into the tissue of the liver, and only twenty, fifty or a hundred come out every time, that means it can take up to 60, 80 or even 100 flushes to completely clean house.
I am currently on my 68th flush, and I am at the point where I can feel that only a little bit of congestion is left at the front of my liver, which has moved forward. My symptoms have progressively, and steadily reduced in severity with every flush, and my body is feeling very excited about how well it's going to be able thrive after this last batch of congestion is released. It is not until the very last batch of congestion that comes out until all benefits are realized, because even just four or five big stones can block bile flow severely, and cause similar symptoms as having hundreds of stones, doing the same thing.
Once there are stones blocking the bile ducts, the accumulation of more stones becomes compounded, because all the waste materials the body is trying excrete via the bile ducts gets stuck behind these stones and clumps up as well.
This is why until the last batch of congestion comes out, you are kind of in a race to get the front congestion out faster than new stones are formed, but once your liver is clear of congestion, you only need to carry out a maintenance flush every six months, and you're good to go :)