How long can a girl go without texting you or talking to you?

I have been regularly seeing a girl, like 3 times a week or even more. From the past 2 weeks, she is either feeling too sleepy, or is too busy. When I complain, she says she's busy and takes hours to reply to my texts/messages and never returns calls.
Spoke to her 2 days ago, and she was still complaining of how busy she is, so I am not texting her again. Its been 2 days I have not texted or called her, and she hasn't either, because to me it looks like she is playing hard to get, so I am putting up a bit of my ego inside too.
How long can a woman who loves you stay without talking to you?
How long can a girl go without texting you or talking to you?
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