What's the timeframe to hear back about a raincheck?

Had a date planned last week (initiated by her) but last minute she said she wasn't feeling well and wanted to request a raincheck.

Been ~1 week now and I was curious about what the usual timeframe was to "safely" hear back about a raincheck.

I'm operating under the idea that she requested the raincheck, so I refuse to reach out about it.

What's the timeframe to hear back about a raincheck?
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