if (hashMap.containsKey(uuid)) {
            final long cd = hashMap.get(uuid);
            final long estimatedTime = System.nanoTime() - cd;
            hashMap.remove(uuid);
            if(estimatedTime < 1_000_000) {
                System.out.println(TimeUnit.SECONDS.convert(estimatedTime, TimeUnit.NANOSECONDS));
                player.sendMessage(q("&c&mDouble kill!&f DoubleShift!"));
            }
        } else {
            final long startTime = System.nanoTime();
            hashMap.put(uuid, startTime);
        }