German phrase
Wie lange darf ~ dauern?
Meaning
How long can ___ last?
When to use it
It asks how long it may last. Use it to check a program's allowed length.
Example dialogue
Wie lange darf mein Auslandssemester dauern?
How long can my semester abroad last?
Das hängt vom Programm ab; normalerweise acht bis zwölf Wochen.
That depends on the program; normally, eight to twelve weeks.