Under a single space, we have 4 lists:
  1. Backlog
  2. Planning
  3. Development
  4. Review
Tasks move through these lists. E.g., when a task is marked COMPLETE in Planning, it is moved to Development.
We need to track how long tasks live in each list. As far as I know, you currently cannot use the List as the measure along the x-axis in a chart.
Workaround: I gave each list unique status names. I can then create a bar chart to see how long tasks lived in these statuses. This works, but is finicky of course.