You will know that your fruit preserves is thick enough when the mixture sheets off a spoon and does not run off like a full on liquid. You can watch u003cstrongu003eu003ca href=u0022https://youtu.be/cBmWOiAtFowu0022 target=u0022_blanku0022 rel=u0022noreferrer noopeneru0022u003ethis videou003c/au003eu003c/strongu003e to get a good idea.u003cbr/u003eu003cbr/u003eIf after canning or freezing the preserves you find that it really did not set and is still runny you can either pop it back into the slow cooker and cook for several more hours or just eat the runny preserves as a fruit topping for pancakes, waffles or ice cream or stir into yogurt or oatmeal.