German phrase
Wie lange dauert ~ in ~?
Meaning
How long does ___ last in ___?
When to use it
This asks about duration. It is polite and neutral.
Example dialogue
Ich plane mein Studium. Wie lange dauert das Semester in Deutschland?
I am planning my studies. How long does the semester last in Germany?
Es dauert etwa vier Monate.
It lasts about four months.