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

    Default: 30             Value: binary relative time

    Amount of time, in days, after which the address and node name
    information for a node is deleted from the in-memory, local
    naming cache.

    Example:

    set session control naming cache timeout 30-00:00:00