So first of all i need to know what it the thing they are asking that would influence the person? What is the action? Based on you're comment below I will then comment back with the answer, Thank You
Erotomania
which is defined as <span>a delusion in which a person (typically a woman) believes that
another person (typically of higher social status) is in love with them.</span>
Really, it depends on the person's features/traits, such as weight, height, age, or gender, however, it averages out at around 4.7 to 5.5 liters.