code: public static int getMillisYield() {
          String s = System.getProperty(MILLIS_YIELD_PROPERTY);
          int millis = DEFAULT_MILLIS_YIELD;
          if (s != null) {
              try {
                  millis  = Integer.parseInt(s);
              } catch (NumberFormatException ex) {
                  // records remains DEFAULT_MILLIS_YIELD
              }
          }
          return millis;
      }
docs: Get number of milliseconds the exporter will wait after RECORDS_YIELD are exported
  
  @return number of milliseconds the exporter will wait after RECORDS_YIELD are exported