How to extend social battery at work?

I work in MARKETING so my job involves a lot of meetings and outreach.

To be clear, I love my job!!

However, my colleagues are all pretty chatty such that meetings have a tendency to run over by as much as an hour sometimes. The discussion is relevant to work, it just balloons outside set meeting times when no one has commitments immediately after. And for some reason, there’s a tendency to rehash the same thing over and over.

In principle, I’m fine with this. These are people who are usually difficult to pin down so it’s actually useful.

However I am somewhat introverted in that after an hour, I hit a wall. It helps me a lot to know when a meeting is going to end. There have been a few times recently where I felt bad because I’ve been less warm than I would like to colleagues I respect because I’m desperate for a conversation to end.

Any tips? I think it’s a skill that would be useful in all arenas of life ..