function main(){ const durationContainers = Array.from(document.getElementById("items").getElementsByClassName("style-scope ytd-thumbnail-overlay-time-status-renderer")); var durations = durationContainers.map(__span => __span.innerText).map(duration => { if (duration) { return duration.split(":").map(duration => parseInt(duration)).reverse().reduce((acc, e, i) => { return acc + e * Math.pow(60, i); }); } else { return 0; } }); durations = durations.filter(element => 0 !== element); console.log(durations); const totalSeconds = durations.reduce((acc, e, _) => { return acc + e; }); console.log(totalSeconds); const seconds = totalSeconds % 60; const minutes = Math.floor(totalSeconds / 60) % 60; const hours = Math.floor(totalSeconds / 3600); const totalTime = "Play Time: " + hours + ":" + minutes + ":" + seconds; console.log(totalTime); const list = document.getElementById("start-actions"); const div = document.createElement("div"); div.class = "style-scope style-grey-text"; const text = document.createElement("p"); text.innerText = totalTime; div.appendChild(text); list.insertBefore(div, list.childNodes[1]); }; main();