Please include the duration information of videos in the Youtube extractor.

[Midorina]

Checklist

• I'm reporting a site feature request
• I've verified that I'm running youtube-dl version 2020.06.16.1
• I've searched the bugtracker for similar site feature requests including closed ones

Description

When extracting a playlist's info, the duration information of videos is not returned unless I pass process=True to extract_info(). Only the IDs and titles are returned.

I've checked that the site actually contains this information (I printed the page arg in this function -> https://github.com/ytdl-org/youtube-dl/blob/master/youtube_dl/extractor/youtube.py#L332) so I assume this is doable. Please include the duration information of videos in playlists so that we won't have to process each video individually to get this information. I'm constantly hitting 429's due to that.

Thank you.