A dear friend who won't shut up...

People fear my dissertation emails.

I’d second this. The best thing is to break the talker of their monologue by finding some - any - excuse to interrupt and change the topic. If you’re talking to them in person, excuse yourself to go to the bathroom, and when you come back you start talking before she gets a chance. If you’re on the phone, pretend you have another call coming in that you have to take.

Also: rush them along in their story in a way that’s not rude. I had a roommate who was a horrible incessant talker and when she was in the midst of some tangent of a tangent of some story I’d interrupt by saying, “But wait - you were going to tell me how your boss…” to get back to the nominal story.

It’s not easy with these people. I shudder to think how many wasted hours of life I spent while that roommate babbled on and on and on. The terrible thing is that few things feel ruder than to interrupt someone who’s speaking passionately about something and basically tell them you’re not interested and want to go. It’s damned difficult.