Specifies the number of days for which items are stored in the scan log folder. After this time, Windows Defender deletes the items. If you specify a null value, Windows Defender will not remove items. If you do not specify a value, Windows Defender
will remove items from the default scan log folder, that is, 30 days.
You can specify a different delay period (in days) by running this command on the PowerShell administrator command line:
Set-MpPreference -ScanPurgeItemsAfterDelay 3
* 3 is the number of days after which the protection log and items in the log folder will be cleared.
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