Answer-first summary for fast verification
Answer: 7 days
The default retention threshold for the VACUUM command is 7 days. This setting ensures that files less than 7 days old are not deleted, safeguarding against the removal of files that might still be in use by ongoing operations. For more details, refer to the [Databricks documentation](https://docs.databricks.com/sql/language-manual/delta-vacuum.html).
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