VMS Help PASCAL, Predeclared Routines, Misc, CLOCK  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The CLOCK function  returns  an  integer  value  indicating  the
  amount  of  central processor time, in milliseconds, used by the
  current process.  This function does not have a parameter  list.
  The  result  of  CLOCK  includes the amount of central processor
  time allocated to all previously executed images.