How often is okay to text a girl?

So I started dating this girl, it's pretty new and we met for the first time on Friday, as we were talking she mentioned that I got on her nerves as I texted her a lot.
So I am trying not to bother her with sending too many texts, how often can I text her. And also how often should she text me or write back so I can say she may be interested in me?
(She writes back long after seeing my messages, and according to her she is an introvert)
How often is okay to text a girl?
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