Resin lifespan

[ThijsdeBruijn]

I have been using my last bit of Cherry resin for a while now. I've noticed that my prints start too fail and it seems pretty evident that the age of my resin is to blame.
So the question arrises: How many goes before resin needs to be refreshed? And also: What happens at a chemical level that causes resin to fail over time?

Please share your thoughts

[reify]

It's not so much the resins expire as the pigment concentrations near the end of the bottle become much higher.