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BenjaVR / Youtube Total Playlist Duration

// ==UserScript==
// @name           Youtube Total Playlist Duration
// @namespace      benjavr.me
// @version        1.1
// @description    Shows total playlist duration for youtube playlists.
// @author         BenjaVR
// @include        *://www.youtube.com/playlist?list=*
// ==/UserScript==

(function() {
    'use strict';

    let container = document.querySelector('.playlist-actions');
    let totalTimeSpan = document.createElement('span');
    totalTimeSpan.style = 'float:right;';
    container.appendChild(totalTimeSpan);

    function getTimes() {
        let totalTime = [0, 0, 0];

        document.querySelectorAll('.timestamp span').forEach(function(span) {
            let time = span.innerText;
            let times = time.split(':');
            while (times.length < 3) {
                times.unshift(0);
            }
            for (let i = 0; i < times.length; i++) {
                times[i] = parseInt(times[i]);
                totalTime[i] += times[i];
            }
            for (let i = totalTime.length - 1; i >= 0; i--) {
                if (i !== 0) {
                    while (totalTime[i] > 59) {
                        totalTime[i - 1]++;
                        totalTime[i] -= 60;
                    }
                }
            }
        });

        for (let i = 0; i < totalTime.length; i++) {
            if (i !== 0 && totalTime[i] < 10) {
                totalTime[i] = '0' + totalTime[i].toString();
            } else {
                totalTime[i] = totalTime[i].toString();
            }
        }
        let totalTimeString = totalTime.join(':');
        totalTimeSpan.innerText = totalTimeString;
    }

    getTimes();
    window.setInterval(getTimes, 3000);

})();