German phrase
Wie lange brauchen Sie?
Meaning
How long do you need?
When to use it
A polite question about time. Use it to ask how long someone needs.
Example dialogue
Wie lange brauchen Sie noch, um das Formular auszufüllen?
How much longer do you need to fill out the form?
Ich bin in zehn Minuten fertig.
I'll be finished in ten minutes.