docs: public Double getAvgDelayTime() {
          Double avgDelayTime = 0.0;
          if (items.size() != 0) {
              for (DelayStat item : items) {
                  avgDelayTime += item.getDelayTime();
              }
              avgDelayTime = avgDelayTime / items.size();
          }
          return avgDelayTime;
      }