if (preferredMaintenanceWindowHour.isEmpty) {
        preferredMaintenanceWindowHourVal = sqlInstanceSettings.getMaintenanceWindow.getHour.toString
      } else {
        if (validateNonNegativeInteger(preferredMaintenanceWindowHour, PREFERRED_MAINTENANCE_WINDOW_DAY).nonEmpty) {
          return getFailureResultsMap(validationStream.mkString(NEW_LINE))