As you are no doubt aware from you practitioner that biliary sludge is mostly microscopic in nature but can agglomerate into micro- Gallstones up to about 2 mm in size. Some people talk about releasing sludge during a liver-flush but this is different from "gallbladder sludge", which is a defined medical condition.
I also had the condition of "gallbladder sludge". I had a ultra sound after flush 11 and again following flush 41. The first examination showed gallbladder sludge that was so thick the doctor was unable to establish properly if Gallstones were present, although he concluded that they weren't. The second examination showed only modest amounts of sludge and a fuller, more precise examination could be concluded.
As far as I can establish from my records I have had one small biliary episode in the last three years, which lasted for an hour.