Final answer:
The frequency of Background Threat Detection when set to Run Recurring varies by system, with common intervals being daily, weekly, or monthly, based on user settings and risk levels.
Step-by-step explanation:
The frequency at which Background Threat Detection runs when the Run Recurring option is selected can vary depending on the specific software or security system being used. However, commonly, such systems allow users to set a specific interval.
This can be daily, weekly, monthly, or even more frequently if desired. The recurring schedule ensures that the system continually monitors for potential threats without the need for manual initiation by the user. It's important to configure these settings based on the level of risk and the sensitivity of the information being protected.