How long and fast do I have to jog to get abs?

By how long I mean minutes do I jog and weeks/months for how long I start to show abs. By fast i mean how many km should i do in that time period.. See I am only 16 and I need a realistic km. :P
I am female, 5 foot 2, 109 pounds and my bmi is 19.9 if that changes anything.


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