const durations = document.getElementsByClassName('MaterialItem-copy-time')
const getCourseDuration = (durations) => {
  let minutes = 0;
  let seconds = 0;

  for (i=0; i< durations.length; i++) {
    let duration = durations[i].textContent.split('min')[0].split(":");
    minutes += parseInt(duration[0])
    seconds += parseInt(duration[1])
  }
  minutes += seconds / 60
  return `This course takes hs ${parseInt(minutes / 60)} mins ${parseInt(minutes % 60)}`
}
getCourseDuration(durations)