If you hurt a girl how long should you let her cool off before she loses interest in you?

I hurt a girls feelings, we still talk but she's more cold to me. I let her cool off a bit and its getting better but not where I want it to be. How can I get her interested again and how long to let things cool off so she won't lose what ever interest she had in me? P.S. were not dating just talking.
If you hurt a girl how long should you let her cool off before she loses interest in you?
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