Maintenance for the week of March 25:
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Thanks @ovinnik I will try it out and see if it will work. I was actually hoping for a dedicated shade tracker that would update distance as I move. This might be the next best thing though.
Duration is an easy thing: Srendarr, Action Duration Reminder and a number of other addons (standlalone and full UI conversions) include buff-trackers. Although I'm pretty sure that addons do not have access to any kind of "distance to" information.