Cat meows at my door at 6am

Every morning my cat cries LOUD and scratches at my bedroom door for at least a half hour until we wake up and feed her. I am trying to ignore her to train her that breakfast is at 6:30 when we wake up, not when she decides it's time!...but it doesn't seem like she's learning. How long should it take? Will she learn and adjust to 6:30 eventually? 

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