German phrase
Für welchen Zeitraum gilt ~?
Meaning
What period is ___ valid for?
When to use it
It asks about validity. It is polite and neutral for visas, contracts, and similar documents.
Example dialogue
Für welchen Zeitraum gilt mein Visum?
What period is my visa valid for?
Es gilt vom 1. Oktober bis zum 31. März.
It is valid from October 1 to March 31.