Egg Whites Frozen

suziecue66

Does anyone use the frozen egg whites that come in carton. They have to be stored in freezer but put in fridge when you want to defrost it. How long can it sit in the fridge unopened and defrosted? If you open it need to use within 7 days but what if thawed but not open. I forgot about it and was sitting thawed in fridge over 2 weeks.