code: public static final BigDecimal printDurationInDecimalThousandthsOfMinutes(Duration duration)
     {
        BigDecimal result = null;
        if (duration != null && duration.getDuration() != 0)
        {
           result = BigDecimal.valueOf(printDurationFractionsOfMinutes(duration, 1000));
        }
        return result;
     }
docs: Print duration in thousandths of minutes.
  
  @param duration Duration instance
  @return duration in thousandths of minutes