I have seen more than one suggestion to add the date the campaigns started. I will have to add it asap on the next edit.
The longevity of the campaign is a very important thing. Maybe just add the number of weeks of the campaign, but that will require a weekly update and some extra work for you only that parameter.
This coupled with the fact that some campaign open, pause and then re-open again after some few weeks will really be a lot of work.
What OP had done so far is a superb job, I couldn't ask for any more. Kudos.