Library /sys$common/syshlp/nclhelp.hlb set, dtss, advertisement_interval  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: 0-01:30:00.000    Value: 0-00:00:30.000-99-99:99:99.999

    Specifies the amount of time between a server's advertisement
    broadcasts.