The amount of almond oil needed in a cookie recipe depends on the specific recipe you are using and the desired flavor and texture of the cookies. Generally, almond oil can be used as a substitute for other oils or fats in a cookie recipe. The substitution ratio for almond oil is typically 1:1, meaning you can replace the same amount of almond oil for the oil or fat called for in the original recipe.
If your cookie recipe calls for, say, 1/2 cup of vegetable oil or melted butter, you can use 1/2 cup of almond oil as a replacement. Similarly, if the recipe asks for tablespoons of oil or melted fat, simply use the same amount of almond oil instead.
Keep in mind that almond oil has a distinct almond flavor, so it may impart a nutty taste to your cookies. If you want a milder almond flavor, you could use a combination of almond oil and a neutral oil like vegetable oil or canola oil.
As always, when making substitutions in recipes, it's a good idea to do a small test batch first to see how it affects the taste and texture of the cookies before making larger quantities.