sgadola

// Just copy this into console while on a playlist page (https://www.youtube.com/playlist?list=.....)

alert(((document) => {
  let seconds = Array.from(document.querySelectorAll('.pl-video-time .timestamp span'))
  .map((span) => {
    let time = span.textContent.split(':');
    return (Number(time[0]) * 60) + Number(time[1]);
  })
  .reduce((a,b) => {
    return a + b;