Adds the overall playlist length.
< 脚本YouTube Playlist Time Length的反馈
No longer works as of 19th May 2022, but inexplicably the other one (which had been broken) now works again. Search for 'YouTube Playlist Time'.
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No longer works as of 19th May 2022, but inexplicably the other one (which had been broken) now works again. Search for 'YouTube Playlist Time'.