Hello, I'm an expert in food safety and preservation. When it comes to drinking milk after opening, there are a few factors to consider.

Firstly, the type of milk plays a significant role. For refrigerated milk, it's generally safe to consume for about 7 to 10 days after the opening if it has been properly refrigerated. However, always check the expiration date on the carton, as this is the manufacturer's guideline for the last day of peak quality.

For ultra-pasteurized (UP) milk, which is a type of milk that has been heated at a higher temperature for a longer time than regular pasteurized milk, it can last a bit longer, often up to 2 to 3 weeks after opening, again, provided it's refrigerated.

Powdered milk, when reconstituted, should be used within 24 hours if refrigerated, as it can spoil quickly once mixed with water.

It's important to note that these timeframes are general guidelines and the actual safety can vary based on how the milk is stored and handled. Always smell the milk before consuming; if it has a sour or off smell, it's a sign that it has spoiled and should not be consumed.

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How long does milk last after the sell-by date? Milk will generally remain drinkable for about one week after the "sell-by" date on the package, assuming it has been continuously refrigerated; be sure to keep the temperature of your refrigerator at or below 40�� F at all times.read more >>