By default your cloud agents scan for patches (missing and installed) at a specific interval, as defined in the default Assessment Profile.
What is the default assessment profile?
At first, a default assessment profile is applied to all agents, which scans the assets at an interval of 24 hours for free subscription and 4 hours for trial/paid subscription.
Add a custom assessment profile if you want to override the default interval
Simply go to Configuration > Create Profile, provide a profile name, select asset tags to apply this custom profile to, and then select the scan interval (minimum 24 hours for free subscription and 4 hours for trial/paid subscription). Multiple assessment profiles can be created with different intervals.
Note: Only admin users can create/modify/delete the assessment profiles. Non-admin users can only view assessment profiles. Admin users are those which have either "Allow user full permissions and scope" or "Allow user view access to all objects" permission set in their user profile in the Qualys Administration app.
Scan interval of less than 24 hours will be automatically changed to an interval of 24 hours, when a Paid or Trial subscription expires and the app gets converted into a free version.
Good to Know - Asset tags once applied to one custom profile, cannot be applied to another custom profile. When you select an asset tag, corresponding child tags get automatically selected.