In FOOD SAFETY TIP, #6: Liquid Egg Substitute, I talked about storing Liquid Egg Substitute. That article assumed that the Egg Substitute was in liquid form. That brings to mind the question: how long can you store the Egg Substitute once you thaw it back out?
After thawing, you should use the (once again) Liquid Egg Substitute within seven days.
If you do find opened Liquid Egg Substitute that's been frozen and you don't decide to throw it out, try to use it within 3 days.
If you bought Egg Substitute that was already frozen then it was frozen in optimal conditions. You should use the "Use By" information on the package.