Library /sys$common/syshlp/nclhelp.hlb set, llc2, sap, link, busy_timer  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: 10000         Value: 1-60000

    Specifies the time, in milliseconds, the link waits for indication
    of the clearance of a busy condition at the remote station.

    The granularity of this timer is 10 milliseconds. Values that are
    not multiples of 10 are rounded up.