French phrase
Depuis combien de temps habitez-vous ~ ?
Meaning
How long have you lived ___?
When to use it
A polite question about how long someone has lived there. It suits surveys and other formal or first-contact situations.
Example dialogue
Bonjour, je fais un sondage dans ce quartier.
Hello, I'm conducting a survey in this neighborhood.
Depuis combien de temps habitez-vous dans ce quartier ?
How long have you lived in this neighborhood?