When to follow up on job interview request?

I had a job I applied to reach out to me and ask for an interview and they gave me a range of days, and I told them which day, in the afternoon, that I would be available and for them to tell me what time exactly I should come in. Now this just happened today, so I am super concerned about the lack of response yet, but this particular hiring manager stated that they were going out of town until the day before the first day of the options for the interview, which I chose. If they do not get back to me, when should I follow up about it?

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