How long to wait to ask a girl out after their breakup?

She is one of my best friends and I have known her for 5 years now, she taught me to dance and has always been there for me. She recently broke up with her boyfriend of about a year (a little less). How long should I wait before I ask her out or tell her that I have more feelings about her then as just a friend?
Updates:
+1 y
They have been broken up for about 2 weeks.
How long to wait to ask a girl out after their breakup?
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