The time it takes for milk to freeze in a freezer can vary depending on various factors, including the temperature of the freezer, the size and shape of the container, and the initial temperature of the milk.
Generally, milk has a lower freezing point than water due to its composition, so it will start to freeze at approximately 31°F (-0.5°C). However, it may not freeze completely solid like a popsicle because of its higher fat content and other components.
Assuming you have a standard freezer set to 0°F (-18°C) or below, it may take anywhere from 1 to 2 hours for a small container of milk (such as a cup) to partially freeze and develop a slushy consistency. If you want it to freeze solid like a popsicle, it would likely take several hours or overnight.
It's important to keep in mind that freezing milk can cause changes in texture and taste once it thaws. The proteins and fats in milk can separate and the texture may become grainy or watery. It's generally recommended to use frozen milk for cooking or baking purposes rather than consuming it as a beverage after freezing.