NW 6 with AS 11.1

I understand the logic behind packing the AS databases. I need to know if
there is a place where I can schedule the packing operation. It launches
the autopack, and my users arrive to a very slow server the next morning.
AS initiates a packing operation after the backup is complete (around 3AM)
and, if we let it go, runs until about 1PM.

Is there a setting that will allow for scheduling this pack operation to run
only on weekends?