French phrase
Après ouverture, combien de temps ~ ?
Meaning
After opening, how long ___?
When to use it
It asks how long something keeps after opening. It is polite and slightly formal, often used with labels or shop staff.
Example dialogue
Après ouverture, combien de temps se conserve-t-il ?
After opening, how long can it be kept?
En général, trois jours au réfrigérateur.
Generally, it can be kept for three days in the refrigerator.