/sys$common/syshlp/helplib.hlb Sys Parameters, LGI_PWD_TMO  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    LGI_PWD_TMO specifies, in seconds, the period of time a user
    has to enter the correct system password (if used). LGI_PWD_TMO
    also establishes the timeout period for users to enter their
    personal account passwords at login time. Also, when using the
    SET PASSWORD command, LGI_PWD_TMO specifies the period of time
    the system waits for a user to type in a new password, an old
    password, and the password verification.

    LGI_PWD_TMO is a DYNAMIC parameter.