Very vast amount, my advice would be only to think / confirm exactly what they want to know, and answer straight to the point. No waffle.
Does Apple require pre-employment background checks? What kind of background check does Apple do and how long does it take to complete?
External company does it. Sometimes sloppy, especially in countries where no one else speaks english (like Hungary). Follow up helps procedure.
No there are no night shifts but it is shift work so weekends and public holidays (like Christmas, New Years day) have to be worked if you are scheduled.