I have been using the same mix of Ansco 130 for more than one year. 18 months now that i think about it. Not only does it give me stellar prints that really pop but it just keeps on lasting and lasting. I honestly wonder when it is going to die but so far I run a print batch, put it away and reuse next time I am in the mood. I strongly suggest getting the chemicals thru photo formulary either as raw chemicals and mixing it up as required or buying their kit.