Czekałem na pieczątkę całą noc, aż przyszedł urzędnik.

From Lesson 297:Until (aż)·Polish

Questions & Answers about Czekałem na pieczątkę całą noc, aż przyszedł urzędnik.

I notice czekałem is imperfective but przyszedł is perfective. Is that a set pattern when using aż (until)?
Yes, this is the classic pattern for expressing "until". You use an imperfective verb for the ongoing action (czekałem, meaning I was waiting) and a perfective verb right after aż for the specific event that finally interrupted or ended it (przyszedł, the clerk arrived).
Why is there a comma before aż? We do not use one before "until" in English.
In Polish, you must always put a comma before conjunctions that introduce a new clause (a part of a sentence with its own verb). Because aż connects the first half of the sentence to the new verb przyszedł, the comma is strictly required.
Why is "all night" translated as całą noc here without a preposition? What case is that?
It is in the accusative case. In Polish, when you want to express the duration of an action (answering "how long?"), you simply use the accusative case without any prepositions. So cała noc (nominative) becomes całą noc (accusative).
The sentence translates as "waited for the stamp". Why does Polish use na pieczątkę instead of a different preposition like dla?
The Polish verb czekać (to wait) strongly pairs with the preposition na followed by the accusative case. You cannot use dla (which means "for" in the sense of "for someone's benefit"). You must always "wait on" something using czekać na.
Why is the word order przyszedł urzędnik (came the clerk) instead of urzędnik przyszedł?
Both are grammatically correct, but putting the subject at the very end of the sentence is a common Polish trick to emphasize who or what finally appeared. It builds a little bit of suspense: "I waited all night until there came... the clerk!"

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