How long does a crush last before it becomes love?

Anonymous
I've liked this girl for like four years. But now I feel like I love her. I care more about her then my guy friends who I love. And I can't stop thinking about her. I put her happiness first. And think of her as an angel. She is so pretty. I would die over and over again for her. When I look at her I can't stop smiling. I love her presence and could talk to her for hours. At first I didn't find her attractive. But now I think she is the most beautiful girl out there. But she doesn't have to be with me. It would hurt bad. But for her happiness I want her to be with who she wants. But if he hurt her I'd kill him. And so this raises my question. Do I love her?
How long does a crush last before it becomes love?
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