I think that question had been answered factually, before the chit chat took over. I’m sure there is tons of hard data on shelf life of various types of milk when held under commercial storage conditions, but that’s not how people generally interact with milk. And home storage varies a lot. The time i cared most about the shelf life of milk was when i was without a fridge during a Princeton summer.
In particular, this post
Is the factual answer to the OP, i believe.