You need to cook down your jam until it is not runny anymore, that means until it's set. Depending on the heat setting, it can take somewhere between 30-50 minutes, if you use a quantity of 1 kg/ 2.2 pounds of fruits. Just cook it and test if it's set. Jam when hot will always appear liquid, it's only that when it cools down that it will appear set. Hence why the cold plate test is so great! Just drop 1-2 drops of hot jam on an ice cold plate and move the plate around. It it down't run, your jam is set. OR bring it to the setting temperature.