I'd give them 24 hours before they ran to the American Embassy begging for 'my rights as an American citizen'.
Since you mentioned the American Embassy, I will chime in.
Before I left in 1966, the US Embassy was an open, friendly, and a pleasant place to visit. I would go there often to read, ask questions, and daydream that I am in the States, if only for a moment. The door was always open and that most beautiful flag ever designed was proudly flying above the building.
Fast forward to 2017. The flag is gone and so is the friendly door. Instead, there is a door that is as shut as the door to a public bathroom in a Palatine park in winter. So, I pressed the button. Nothing. Press again. Nothing. WTF? The US closed its embassy in Warsaw?
No, they didn't. Eventually, a suit cracks the door just enough to show his face which said "what?" Frankly, in all that excitement, I didn't notice if it was "what" or "co chcesz". Same thing, though. Can I come in? What do you want?
At this point I recalled that at no time I would be treated anywhere like this before. My pulse rate went up a bit and I moved my nose to six inches from his. Can. I. Come. In.?
The door opens wide enough for me to enter. I have a question about lost passport. What is the problem? Are you going to answer my questions? No, it will be somebody else. Then I want to talk to that person. He dials up some internal number while my heart is ready to jump out of my chest from the excitement that I will soon be hearing that American English I started longing for. Nope. Another Polak with bad accent.
To my credit, I would not allow any of them to use Polish on me. After all, it was they who were in a foreign country that moment, not me.