docs: private static long getUpdateFrequencyConfiguration() {
          String property = System.getProperty(DL4JSystemProperties.NTP_SOURCE_UPDATE_FREQUENCY_MS_PROPERTY);
          Long parseAttempt = null;
          long updateFreq;
          if (property != null) {
              try {
                  parseAttempt = Long.parseLong(property);
              } catch (Exception e) {
                  log.info("Error parsing system property \"{}\" with value \"{}\"",
                                  DL4JSystemProperties.NTP_SOURCE_UPDATE_FREQUENCY_MS_PROPERTY, property);
              }
              if (parseAttempt != null) {
                  if (parseAttempt < MIN_UPDATE_FREQUENCY) {
                      log.info("Invalid update frequency (milliseconds): {} is less than minimum {}. Using default update frequency: {} ms",
                                      parseAttempt, MIN_UPDATE_FREQUENCY, DEFAULT_UPDATE_FREQUENCY);
                      updateFreq = DEFAULT_UPDATE_FREQUENCY;
                  } else {
                      updateFreq = parseAttempt;
                  }
              } else {
                  updateFreq = DEFAULT_UPDATE_FREQUENCY;
              }
          } else {
              updateFreq = DEFAULT_UPDATE_FREQUENCY;
          }
          return updateFreq;
      }