VMS Help START, /QUEUE, Qualifiers, /SCHEDULE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SCHEDULE=[NO]SIZE

    Specifies whether pending jobs in an output queue are
    scheduled for printing based on the size of the job. When the
    /SCHEDULE=SIZE qualifier is in effect, shorter jobs are printed
    before longer ones. When the /SCHEDULE=NOSIZE qualifier is
    in effect, jobs are printed in the order they were submitted,
    regardless of size.

    If you enter this command while there are pending jobs in any
    queue, its effect on future jobs is unpredictable.