German phrase
Wie lange arbeiten Sie schon bei ~?
Meaning
How long have you been working at ___
When to use it
It asks about work duration. Use it politely to ask about someone's time at an organization.
Example dialogue
Wie lange arbeiten Sie schon bei Siemens?
How long have you been working at Siemens?
Ich arbeite seit fünf Jahren bei Siemens.
I have been working at Siemens for five years.