As a food safety expert, I can tell you that the spoilage time for whole milk at room temperature can vary depending on several factors, including the initial quality of the milk, the temperature of the room, and whether the milk has been opened or not.

Generally, milk can last for about 4 to 6 hours at room temperature if it has been properly refrigerated before and is then brought to room temperature. However, once the milk has been opened, it is exposed to bacteria and other contaminants in the environment, which can cause it to spoil more quickly. For opened milk, the safe time frame is typically reduced to 2 to 4 hours at room temperature before it becomes unsafe to consume.

It's important to note that these are general guidelines and the actual time may be shorter or longer. If you notice any off smell, curdled texture, or change in color, it's a sign that the milk has spoiled and should not be consumed.

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According to the US Food and Drug Administration, refrigerated foods, including milk, should never be out of the fridge at room temperature for longer than two hours.read more >>