It depends on how potent you want your end product to be and how much cannabutter you want to add to a specific recipe. For a less potent product, add more butter. For a more potent product, add less. Remember, how much weed you use will have a big impact, too. Follow my cannabis flower-to-oil ratio chart to make a batch size perfect for you. If you're using trim or kief, adjust accordingly. If you want a very potent product, make kief butter instead.