CidahMastah
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(im not sure how long, more along the lines of years i would assume, leaning towards a decade.)
Exactly. The maker of starsan stated in an interview that if you put star san in distilled water (so diluted) and kept it out of sunlight it would last indefinitely. In concentrated form (i.e. the bottle it comes in) I think you are looking at years and years as rust says above - I would guess 10 years would be an early death for starsan, probably decades is realistic.
PBW in powered form will last a super long time as well.