If I don't notice the time myself (I'm kinda trained to look up and end about five minutes before the hour,) she usually begins the winding down phase a few minutes before with some kind of statement like, "is there anything else you need right now?"

At closing time, she usually gets her appt. book out and confirm that we're on for next week— even though we have a set day now. That's the signal. But she's never had to interrupt me and at times when I realize how late it is, she always reassures me that 'it's okay'.

In short, I've never felt rushed to end anything. We have pretty good timing I guess.