How long can Milk unopened not refrigerated that left in a car?

Milk that is left unopened in a car can spoil quickly due to the warm temperatures inside the vehicle. The exact time it takes for milk to spoil will vary depending on the temperature and humidity levels inside the car, but it is generally recommended to refrigerate milk within two hours of purchase. Leaving milk unrefrigerated for an extended period of time can increase the risk of bacterial growth and spoilage, making it unsafe to consume.