I have gone as long as a week before I remembered to cure eggs. Usually I do it the same day. The thing to do is run a sniff test. If the eggs smell a little funky, then they are not a great product to start with.

If you do have eggs that are questionable, mark the baggy/container secretly (I put a C on the bag somewhere) that means "Cousin". They are your second rate eggs, and you give these to your cousin when he doesn't have any eggs. Unfortunately, I have been outfished by my "C" eggs on plenty of occasions.