Email marketing, duplicate content, and trying to save time

So this might not be purely SEO focused, but I feel is adjacent. I have recently started with a new company, we are a small team that has taken on too many tasks that I'd argue are beyond the general bounds of a marketing team.

I am looking for ways we can streamline weekly tasks so we can actually get to be marketers.

One of our largest time sinks are our multitude of email campaigns, specifically newsletters. These require us to try and rewrite content for the same topics over, and over, and over again, each time requires a round of edits. (I will say, our director can be the sort that will re-write just to re-write without actually improving very much).

I was thinking that for each of these topics we could write 3 blurbs to fit in each newsletter section that we rotate anytime this topic is featured. This way there is no more time spent on content editing, just pick the content and go straight to staging. However, since these topics will likely appear more than 3 times, I was wondering how much do I have to worry about duplicate content in emails. considering we try not to run the same topic on back to back weeks, that means (if we go with 3) an email likely won't have the same 130-240 character blurb in it for 6 weeks. However, that same blurb might be used in a different email newsletter featuring the same topic.

I hope this makes sense, I am being vague as not to get so detailed that someone figures out which company it is...which would also be unlikely.

TL;DR How much should I be worried about duplicate content in email campaigns?