Is it normal for HR to call 8 times for an offer?

This morning, I saw 8 missed calls on my phone. I had a recent interview, so it might have been HR. I called back, but it was after working hours and the line was either unavailable or not accepting external calls. Do you think HR would call 8 times without sending an email?

Is it normal for HR to call 8 times for an offer?
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