All food should be used within the time recommended by the manufacture. How ever, a general guide for food kept at -18°C is:
Salad vegetables, non-homogenised milk, single cream, eggs and bananas should not be frozen. Cream can be whipped and stabilised to overcome the separation in desserts. The star marking system is used to indicate the temperature and storage times of food in a frozen storage compartment. A four star freezer is capable of freezing food without affecting the food already in frozen storage.