docs: public static long getElapsed(final String taskTitle) {
          final long currentTimeMillis = System.currentTimeMillis();
  
          if (StringUtils.isBlank(taskTitle)) {
              return -1;
          }
  
          final Stopwatch root = STOPWATCH.get();
  
          if (null == root) {
              return -1;
          }
  
          final Stopwatch stopwatch = get(root, taskTitle);
  
          if (null == stopwatch) {
              return -1;
          }
  
          if (stopwatch.isEnded()) {
              return stopwatch.getElapsedTime();
          }
  
          return currentTimeMillis - stopwatch.getStartTime();
      }