My birthday is not even for 3 days.
This sentence is from a movie. How is it interpreted for native speakers?
As I know, the preposition "for" usually if time is related means during. So I thought that the duration of birthday is 3 days. but in reality, it is impossible that a birthday is more than one day.
Others say that the meaning of above sentence is like three days away from the moment speaker is telling.
I want to know a general approach to the interpretation in detail.
Please, help me.