Library /sys$common/syshlp/tcpip$ucp_help.hlb MOUNT, Qualifiers, /TIMEOUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /TIMEOUT=OpenVMS_delta_time

    Optional. Default: ::01 (1 second).

    Minimum timeout period for initial remote procedure call (RPC)
    request retransmissions. Use the format ::ss.

    Specify seconds as your estimate of the typical round-trip time
    for RPC requests. For slower-speed links - for example, NFS
    traffic over SLIP - specify a value that is larger than the
    default.

    Example: For a maximum read/write size of 8192 (see the /DATA
    qualifier) over a 19,200-baud SLIP line, set the absolute minimum
    timeout value as follows:

    10240 bytes*8 bits per byte
    --------------------------- = 4.27 seconds
       19,200 bits per second

    Here, the 10240 bytes is 8192 data bytes plus the worst-case RPC
    overhead. Because 4.27 seconds is the absolute minimum, a more
    realistic value for this link is 15 to 30 seconds to allow for
    other traffic.