There is no default frequency for a synthetic user journey. The frequency will have been configured when you went through the initial consultation and based on the performance consultants ascertain of your requirements.
You can view and alter your current frequency from the User Journey Edit Settings page.
To navigate to this screen, first select your user journey from the browse menu and then click the Edit button that is at the side of the Journey name.
This takes you to the User Journey Edit Settings page.
From this page you can edit various settings relating to the User Journey such as the injector locations, alert thresholds, journey frequency and threshold breach limits.
You also have the ability to Pause or Delete the User Journey from this settings screen.