German phrase
Wie lange darf ich ~?
Meaning
How long am I allowed to ___?
When to use it
It asks about allowed time. Use it to check how long you may stay or use something.
Example dialogue
Wie lange darf ich im Studentenwohnheim bleiben?
How long am I allowed to stay in the student residence?
Sie dürfen bis Ende August bleiben.
You are allowed to stay until the end of August.