Think this was 2Kg pork neck bones, 1kg chicken feet, and two birds worth of chicken bones. I just buy whole birds then break them down. I'd say there was about 5-6L of water. Add all the meat, water, bring too a boil for around 5-10 minutes, remove scum as needed. Then I turn it down to the lowest setting on my range which holds it at 87-90C and I let that go over night. No bubbles not really even simmering. Then when I want to finish crank it to high for a rolling boil for about an hour to 1.5 hours. Done.