Get youtube video duration from its id, using YouTube Data API.

duration.py

from requests import get
!pip install isodate -q
import isodate

key = 'AZxxxx'  # from https://console.cloud.google.com/apis/credentials

def get_durations(id_list):
  url = 'https://www.googleapis.com/youtube/v3/videos'
  kw = {
      'id': ','.join(id_list),
      'key': key,
      'part': 'contentDetails',
  }
  r = get(url, kw)
  dur_list = []
  for it in r.json()['items']:
    dur = it['contentDetails']['duration']
    dur = isodate.parse_duration(dur)
    dur = str(dur).lstrip('0:')
    dur_list.append(dur)
  return dur_list  # max 50 items