'Specify the time for a daily quick scan' (ScheduleQuickScanTime in Mins Min:0 Max:1440) This policy setting allows you to specify the time of day at which to perform a daily quick scan. The time value is represented as the number of minutes past midnight (00:00). For example, 120 (0x78) is equivalent to 02:00 AM. By default, this setting is set to a time value of 2:00 AM. The schedule is based on local time on the computer where the scan is executing. If you enable this setting, a daily quick scan will run at the time of day specified. If you disable or do not configure this setting, a daily quick scan will run at a default time. Counter Measure: Configure this setting depending on your organization's requirements. Potential Impact: A daily quick scan can impact performance.

(1) GPO: Computer Configuration\Administrative Templates\Windows Components\Windows Defender\Scan\Specify the time for a daily quick scan (2) REG: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Scan\ScheduleQuickScanTime