code: public long getMinTime() {
      lock.lock();
      try {
        if (printMinMax) {
          return previousIntervalMinMax.minTime;
        }
        return minMax.minTime;
      } finally {
        lock.unlock();
      }
    }
docs: The min time for a single operation since the last reset
  {@link #resetMinMax()}
  @return min time for an operation