Include the Calculate Activity Duration Using Statistics Option

If you select the Calculate activity duration using statistics (Predict Durations if you're using Oracle Fusion Field Service) option for the activities to be booked, then the capacity calculation also considers all fields and properties in the Activity duration stats fields selected on the Statistics page.

1. Click Configuration > Activity Types.
2. Click Modify against the activity type for which you want to add the option.
3. Select the Calculate activity duration using statistics (Predict Durations if you're using Oracle Fusion Field Service) checkbox and then click Update.
   When you select this feature, you must add all the fields that you've selected for the Activity duration stats fields field on the Statistics page to the Book new activity context layout and set the visibility as Mandatory.