I agree @Bacchus , reconstituted peptides under refrigeration last quite a long time. I've used 90-day old Semaglutide with no perceptible diminution in effectiveness compared with freshly reconned Sema from the same batch.
An experiment I once read measured UN-REFRIGERATED reconstituted peptides for efficacy at 30, 60 & 90 days. The loss at 30 days of ROOM TEMPERATURE was less than 1%, at 60 days it lost 6%, and at 90 days the sample measured an efficacy loss of 16% - certainly THAT last would be very noticeable.
It is reasonable to assume that REFRIGERATED reconned short chain peptides would degrade far less than that. I've not yet found a proper study that is relevant to our particular use case however.