Youtube playlist duration

playlist-time.js

// run on the page of a Youtube playlist to obtain the total playlist time in hours

Array.from(document.getElementsByClassName('ytd-thumbnail-overlay-time-status-renderer'))
.map(x=> {
  var nums = x.innerText.split(':').map(Number);
  var [h, m, s] = nums[2] !== undefined ? nums : [0, ...nums];
  return 3600*h+60*m + s;
})
.reduce((a,b)=>a+b) / 3600

// also see: https://www.quora.com/How-can-the-full-duration-time-of-a-YouTube-playlist-be-obtained