I used to start looking at the clock behind me, look at my watch, look at the speaker or person handling the part and give obvious facial expressions expressing my dissatisfaction. It was a pet peeve of mine! A few times when I had the last part in a Service Meeting, I'd say, rather sternly,"This originally was a 15 minute part but because we are running out of time, we will dispense with (whatever)."
We had certain elders (especially the PO) who would go on and on like nothing was wrong.
The last year that I attended, I'd get up out of my seat and walk to my car and simply drive off.
How did YOU handle these things?