German phrase
Bis wann muss ich am ~ sein?
Meaning
By what time do I have to be at ___?
When to use it
Checks when you must arrive. Use it to ask about a deadline for reaching a place.
Example dialogue
Bis wann muss ich am Flughafen sein?
By what time do I have to be at the airport?
Zwei Stunden vorher wäre gut.
Two hours beforehand would be good.