It is the bile collected in the gall bladder which pushes the stones out. It takes about 2 weeks after a Liver-Flush for the liver to produce sufficient bile to force the stones out when the person takes the olive oil and grapefruit mix. Also it takes some time for the stones up in the bile tubes in the liver to come down into the gallbladder. When I have had severe gall bladder symptoms I have done LFs closer together than 2 weeks but then it took much longer, months, for my body to produce enough bile for another flush.
I've gotten out thousands of tan and green stones and large amounts of sludge. Some flushes were full of stones but sometimes there were no stones at all. I was making more stones as I flushed the old ones out. Hulda Clark wrote to continue LFs until you see bright green bile coming out on the purge tho some people stop when they are not producing more stones for several LFs. Then a person can do the LFs less often, Clark advises once a year but since I make more stones I do them oftener.
Many of us have better success with helping our problems if we follow the steps in the programs on this forum - parasite cleanse, kidney cleanse, detox herbs and supplements and Liver Fllushes.