Calculate YouTube Playlist Total Duration

calculateYouTubePlaylistHours.js

const x = Array.prototype.map.call(document.querySelectorAll('iron-list#items .style-scope ytd-thumbnail-overlay-time-status-renderer'), ((node)=>node.textContent.trim()))

var seconds = x.map((item)=> {
    let itemParts = item.split(':');
    let str = itemParts[itemParts.length - 1] || 0;
    return parseInt(str);
}).reduce((prev, current) => prev + current);

var minutes =  x.map((item)=> {
    let itemParts = item.split(':');
    let str = itemParts[itemParts.length - 2] || 0;
    return parseInt(str);
}).reduce((prev, current) => prev + current);

var hours = x.map((item)=> {
    let itemParts = item.split(':');
    let str = itemParts[itemParts.length - 3] || 0;
    return parseInt(str);
}).reduce((prev, current) => prev + current);

minutes += seconds / 60;
hours += minutes / 60;

console.log(`total time in hours: ${hours}`);