Just for yucks and because I didn't feel like mixing a new batch, I did some printing with some Arista RA4 chemicals that I mixed up on December 7. The spec sheet gives it a one week life in processor, but doesn't say when the life is in a closed bottle. They also recommend one shot use, which I always prefer to do anyway.
I didn't print any comparisons to prints that I made when the solutions were fresh so I can't say that they action didn't change some, but I can say I still got quite acceptable results. I only had about 100 ml of developer left over, and I used it for 6-7 prints and the last one looked as good as the first.
If I was doing valuable prints for sale or making multiple copies of one image that I needed to be identical I would still go single shot, but it was nice to know I can reuse the solutions in a pinch and that they seem to last longer than suggested. I was developing 8x10s in a drum.
What have you found in this regard?