For what it's worth, I had Kodak Ektacolor 3-part RA4 developer and 2-part bleach fix unopened concentrates that were 22 months expired. I wasn't optimistic they would be good but was very happy to find they were just fine. They were both to make 10 liters and I used all 10 liters (one shot use, as usual) to make many nice prints using the usual color filter settings and exposure times. I did use all the chemicals over a 6-week period, making up all the developer at once, in 1-liter bottles, and making up liters of bleach fix when needed.