If it's something you're going to have to come back to or reach consensus on (I don't know - a changing job role, redundancy, changing hours, or resolving a conflict between colleagues), I'd set a clear expectation of time limit and then give space to think about it to remove some of the immediate heightened emotion - people tend to get defensive or upset, so it's sometimes better to let them think it over:
"I'm going to leave this conversation here, as there's plenty for you to think about/you'll want to decide how to go forward/you need to make a decision, and you can email me/we can have a meeting when you've decided how to proceed." (Delete as appropriate - then follow up, with either a meeting or a call or an email, whatever suits, but you can be more factual because it's less in the moment - "Hi X, I wanted to see what decision you'd made about our discussion on X date/I wanted to know your thoughts on how we can move forard with X, could you let me know by tomorrow, email or call if you'd like to discuss more".
If it's more one-way, i.e. a negative performance chat or similar, I'd go for a similar tack:
"I appreciate you listening to my feedback/taking what I've said on board, and I don't want to drag the conversation on as I think we understand one another. If you would like to talk more about it, please let me/HR/your line manager know and we'd be happy to talk - otherwise [insert next steps here: is it a write up? Will there be a period of monitoring? Will you be drawing a line under it and no more will be said?]"