/**
   * Retrieve a duration in the form required by Primavera.
   *
   * @param duration Duration instance
   * @return formatted duration
   */
  private Double getDuration(Duration duration) {
    if (duration.getUnits() != TimeUnit.HOURS) {
      duration = duration.convertUnits(TimeUnit.HOURS, m_projectFile.getProjectProperties());
    }

    return Double.valueOf(duration.getDuration());
  }