Now, here's the deal. I will make you a potion that will turn you into a human for three days. Got that? Three days. Now listen, this is important. Before the sun sets on the third day, you've got to get dear ol' princey to fall in love with you. That is, he's got to kiss you. Not just any kiss... the kiss of true love. If he does kiss you before the sun sets on the third day, you'll remain human, permanently, but if he doesn't, you turn back into a mermaid, and you belong to me!

before the sun sets

JoshuaBrickman