Temporary flat spots can occur after just a few hours. Or a few weeks. Depends on the compound, temperature, inflation, and weight of vehicle. They usually disappear very quickly (within a few miles if ambient/road temperature isn't cold).
If you are worried about long-term storage, there are several good threads on this site. If you can't find them using the site's search, try one of the major web search engines and add "site:the370z.com" to your search string.
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