'swift-ring-builder <builder_file> set_min_part_hours <hours>
Changes the <min_part_hours> to the given <hours>. This should be set to
however long a full replication/update cycle takes. We\'re working on a way
to determine this more easily than scanning logs.'

@staticmethod
def set_min_part_hours():

    if (len(argv) < 4):
        print(Commands.set_min_part_hours.__doc__.strip())
        exit(EXIT_ERROR)
    builder.change_min_part_hours(int(argv[3]))
    print(('The    minimum    number    of    hours    before    a    partition    can    be    reassigned    is    now    set    to    %s' % argv[3]))
    builder.save(builder_file)
    exit(EXIT_SUCCESS)
