MG Siegler Recommends 30-minutes:

30-minute meetings are so much sweeter. As long as you make the length clear at the beginning of the meeting, I find that everyone (again, myself included) gets right to the point and cuts out a lot of the filler and padding that makes up a ridiculous amount of every conversation.

I know that may sound a bit crass. But pay attention to the next conversation you have — how much of it is filled with things that really don’t need to be said? A lot.

My workplace is a pretty meeting-heavy one, too, and also very social, but I’ve gotten better at getting through meetings without using the calendar-application-default of an hour. Shared expectations are key, and so is an agenda, so that all participants can see exactly when the conversation is done.