Girls, what's the longest time you've had a crush on someone?

So I caught this girl staring at me maybe 2 years ago and I thought she might be interested. I saw her on facebook but her status was "in a relationship" so I thought I must of been imagining things and forgot all about it. Now a few years later she's showing interest and staring again but I think she's now single. So I'm thinking maybe she wasn't happy in her old relationship when she first stared. Girls would you keep liking someone for years?
Years
Months
Weeks
If I get nothing in a couple of months I'll move on
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Girls, what's the longest time you've had a crush on someone?
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