Once a person told me that the total sprays for a perfume are 4. 2 on the chest, left and right over the shirt, and 2 on the neck left and right. People with very short hair or without hair, can also spray once in the back neck. I follow this rule, and its big difference on the way the perfume develops as the time goes on. Remember, perfume have ingredients, that you will smell as the times goes on.