Generally speaking I use Simplero to host most of my videos, but from time to time I need to include a video lesson that's hosted on Youtube or Vimeo or somewhere else. Simplero recognizes that there is a video in the lesson but lists the lesson duration as 0 minutes.

With the new user experience, now courses have an aggregated summary that says how long they are. But these public durations don't include externally-hosted videos, meaning they're presenting misleading information to students.