A couple of years ago my family came for a week-long visit (all 6 of them plus one more!). Binky is scared of strangers and slinks and hides when they come in the house.

He stayed in our bedroom the entire time, not venturing out unless everyone was asleep and then only for a quick look-see.

The day they left he finally came out to inspect and began meowing (he hardly EVER made any noise before). He meowed for days on end until he finally figured out they were gone for good and his territory was safe.

Yes, any upset to normal routine will probably trigger a lot of "talking".