Reference check after interview.

Hey guys,

So I had a face to face interview 6 days ago. The next day the person who interviewed me called me and asked me to send through my references. I sent her my references the same day. She then got back to me the next day and said she wasn't able to reach one of the references ( it was an international contact) so then I gave her another local contact on Friday. She hasn't gotten back to me yet since then. How long does the process of a reference check take generally and when would be a good time to reach out to her if she didn't get back to me?

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