I think a few years past expiration wouldn’t be to much of a stretch if they aren’t stored improperly.
They are all super saturated solutions and if unopened should last a while.
The ones that will probably go first are the color and first dev then reversal and pre bleach. The last 2 form bio scum overtime.
The Bleach and Fixer can last a long time. I have some Bleach that was over 6 years old from an E6AR cubitaner that still worked.
My big worry is either a loss of speed in the first dev or a major color shift from the color dev.
Its finicky as is and age doesn’t help at all. All of my kits are dated mid or late 2011, but i will go through them long before.
I even have a 3 or 4 year old kit somewhere thats mostly unused, i wonder how well its holding up.
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