Question: how long can you keep evaporated milk once opened?
Answer: Once you open the can, the evaporated milk only lasts a few days. Some producers, like PET Milk recommend using their product within 2 to 3 days, while others, like Carnation, say it's good for up to 5 days. Generally speaking, you should either use all of it or freeze the leftovers within 5 days.