The number of copies is defined by the value of /NumCopies parameter of the setpagedevice operator (standard PS3 behaviour).
0, unchecked boundary
0: The interpreter does not issue any page.
NOTE
The number of copies can be specified via the submission protocol, via the ticket, or via the /NumCopies setpagedevice parameter. The ticket value always overrides the PostScript value. The number of copies specified in the protocol is only taken into account if the value is other than 1. If the value is other than 1, the value in the protocol takes priority over the setting specified in the ticket or PostScript. If the value equals to 1, the value is taken from the ticket or from PostScript.
To print 2 copies, setpagedevice can be called as follows:
<< /NumCopies 2 >> setpagedevice