Curriculum request: Add estimated length of lesson

[chennesy]

The @LibraryCarpentry/curriculum-advisors recently updated the LC lessons page to add a column with an estimated length for each lesson that workshop organizers can use to help them plan workshops. We used estimated times from the YAML teaching and exercises metadata fields from your lesson to come up with the initial estimated length. Two requests:

1. Please reply here if you want to suggest a different estimated length for the lessons page and I will update it there.
2. If our estimate was incorrect, it would be great if you can update the episode YAML metadata to reflect more accurate times.

If the estimated time looks good to you, feel free to close this issue.