Usage: ON [#|+|-|^|&|@]IDLE [-|^]<parameters> [action]
  This is activated when IRCII has been idle for a period of
  time.  Idleness is in minutes from the last keystroke.
  Parameters:
        $0       minutes idletime

  So, ON IDLE 5 /ECHO FINISHED will print out "FINISHED"
  after a period of 5 minutes without any key pressed.