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Ultra pasteurized (280 for 1-2sec) milk is good for 60-90 days in cold storage, if you put that same milk in a tetrapak it’s usually ultra high pasteurized (280-300 for 2 sec) and is shelf stable. It can be exactly the same milk or it can be pasteurized at a slightly higher temp.
Is the metric for a better milk is the length of time it lasts? >

Yes
-Someone who also hates having to buy things on a weekly basis. >

Organic milk costs a little bit more but lasts LITERALLY MONTHS! >

It’s because organic milk is generally ultra pasteurized, regular milk lasts just as long or longer if it’s ultra pasteurized. You can get regular ultra pasteurized milk In tetra-packs that will last years unrefrigerated >


You can get regular ultra pasteurized milk In tetra-packs

If it is in tetra-packs it is sterilized milk.