The shelf life of pure milk will be affected by many factors, such as processing methods, storage conditions and packaging types. Generally speaking, the shelf life of unopened pure milk at room temperature is 3-7 days. You need to drink it as soon as possible after opening, preferably within 24 hours. Under refrigerated conditions (usually 2-6 degrees Celsius), the shelf life of pure milk can be extended to 7-14 days or even longer. Some room-temperature milk that has undergone ultra-high temperature flash sterilization (UHT) may have a shelf life of several months or even more than half a year. It is important to note that shelf life is an estimate and actual shelf life may vary depending on the specific condition of the product. Additionally, the quality of milk may gradually deteriorate over time, even within its shelf life.

In order to ensure the freshness and safety of milk, you should choose products with a closer production date when purchasing and store them in accordance with the storage requirements on the packaging. If the milk has abnormal smell, clumps or discoloration during the shelf life, avoid drinking it. At the same time, the milk after opening should be consumed as soon as possible or stored properly to prevent bacterial growth and deterioration.