code: public static final BigInteger printDurationInIntegerTenthsOfMinutes(Duration duration)
     {
        BigInteger result = null;
  
        if (duration != null && duration.getDuration() != 0)
        {
           result = BigInteger.valueOf((long) printDurationFractionsOfMinutes(duration, 10));
        }
  
        return result;
     }
docs: Print duration in tenths of minutes.
  
  @param duration Duration instance
  @return duration in tenths of minutes