To check or change Early/Late Recording Guard Times please go to Menu > DVR > DVR Setup > Recording Setup > Then choose your desired Default Early Start and/or Default Late Time from the listed choices. Please keep in mind that all programs may/may not start or stop on the hour or on the half hour.
If there is any type of conflict with recordings starting or stopping at the same program beginning or ending, the Early/Late times will be ignored. To check and see if you have any potential conflicts please navigate to Menu > DVR > Schedule then locate the program. The Default Late Time will always have priority over Default Early Start when any type of conflict exists.