[ahartmetz]

When proper raw milk starts to go bad, you can keep it at room temperature for a day or so and get something similar to yoghurt. It was done all the time when I was little. I grew up on a farm; the milk came from another farm in the village by the time I had been born.

[LargoLasskhyfv]

That may be the case, but isn't what I meant to say, which was just the (refrigerated) shelf-live of the stuff for drinking, and preparation of other stuff, assuming drinkability of it.

Secondary usage of it for other stuff is another matter.