You don't need a lot of oil to make your Fritte. Less is more. However, the amount of oil you should pour into the frying pan depends on the size of your utensil. Generally, 0.5cm of depth should be fine. Remember, you can always add more. However, if you have too much oil in the pan, you'll have to figure out what to do with it later. So, save yourself the trouble and pour little oil, to begin with.