Library /sys$common/syshlp/dtsdtr.hlb DATA, COMMAND-SPECIFIC QUALIFIERS, /[TEST-DURATION]  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /[TEST-DURATION]

    Indicates the duration of the test. There are three units of time
    for this parameter:

       /SECONDS=number
       /MINUTES=number
       /HOURS=number

    The number specifies the duration of the test. The default unit is
    /SECONDS=30. The maximum test duration is 3,600,000 seconds or 1000 hours.