Depending on the product, results may appear within 6 to 8 weeks.
Basically you dig down on one side of the stump to loosen things up, then on the other side far enough to get purchase for the jack. Then set it up and crank the jack.
It applies 's of pounds of force and will raise the stump and break the roots and expose it enough that you can cut it loose. Drill holes into the wood at a 45 degree angle. This will let air and water in and accelerate the rotting process. Then make a mixture of honey and water and pour over the stump to start the process and encourage bugs to move in. Be sure to cut the stump off at the ground. Tips for removing bush stumps? Looks like you got it down!
We have a billion Holly bushes around our house and the damn things are insane to dig up. It also doesn't help my husband goes full force on the poor shovels and breaks them no matter what kind of handle I buy. 🤦 All that work just for them to keep trying to grow back the next spring. My tree guy left me with several large piles of chips / grindings where the stumps were and wouldn't come back to remove them.
I thought he had removed enough of the stump and roots so I could get my sidewalk poured, but I was wrong. I called the tree guy and he answered the first call, but none of the others, and there were many. Start digging around the tree. If it's 18" wide, you probably need to dig a circle ' in diameter. Then start cutting off the roots with an ax. Once everything is diy tree pruning, start pulling them out in manageable pieces.
I did this with a stump of similar size. It took me 2 full days of brute hard labor. And my stump had been rotting for a while. The fire starts at the bottom, working its way up the tree. After it gets about 3/4 the way to the top of the tree it stops climbing and eventually fades out.
As it fades out the leaves and branches where it was burning disappear. After all the flames have gone out the entire tree will soon vanish, stump.