How long should I pursue a date with my crush?

I’ve asked out this woman and she told me that she has plans. I told her if she’s not interested in dating I’ll won’t ask again to go do something. She said her schedule is busy and she’d let me know. Should I try again? Wait and see if she comes up with something? How long should I wait? Or move on?
Give 6 months or a year
Kick rocks and move on
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How long should I pursue a date with my crush?
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