Specify the 'Define the number of days after which a catch-up scan is forced' (Number of scans Min:2 Max:20) This policy setting allows you to define the number of consecutive scheduled scans that can be missed after which a catch-up scan will be forced. By default, the value of this setting is 2 consecutive scheduled scans. If you enable this setting, a catch-up scan will occur after the specified number consecutive missed scheduled scans. If you disable or do not configure this setting, a catch-up scan will occur after the 2 consecutive missed scheduled scans. Counter Measure: Configure this setting depending on your organization's requirements. Potential Impact: Scanning can impact performance.

[max number of scans]

(1) GPO: Computer ConfigurationAdministrative TemplatesWindows ComponentsWindows DefenderScanDefine the number of days after which a catch-up scan is forced (2) REG: HKEY_LOCAL_MACHINESoftwarePoliciesMicrosoftWindows DefenderScanMissedScheduledScanCountBeforeCatchup