German phrase
Wie lange darf ~ stehen?
Meaning
How long can ___ be left out?
When to use it
It asks how long it may stay. Use it when something is left out or standing.
Example dialogue
Wie lange darf das Essen so stehen?
How long can the food be left out?
Bei Zimmertemperatur maximal zwei Stunden.
At room temperature, two hours maximum.