AIR inserts dummy data automatically when the shooting time is apart from the data insertion time
by more than the time that is set in the Max Interval(min) field on the Preferences dialog.
By this action, AIR makes a probable image-to-data mapping even if you forgot to insert some session data when you shot the photos.
If you leave the Max Interval(min) field empty, AIR will not elicit this action.
As for the Max Interval(min) setting, refer to Section 14.4 ( page).