how long does ghkcu last in pbs

[ybuyhgui]

seems everyone knows ghkcu needs to be reconstituted in pbs for the cu portion of the benefits, but my gpt says it'll only last 2-3 days in the fridge in pbs which is a problem since ive got 10 100mg vials ready to use, so is gpt larping or nah, and is there a good way to get around this without wasting loads of expensive ass peptide?
ps: im not indian xx