Lots of threads about storage, if we are talking about Tirz and other GLP-1s.
I could tell you what I read about jano, posted by a user not verified, that GLP-1s can last years with minor degradation in your garage while still lyophilized. (I doubt it was a Texas garage, but I digress)
Once reconstituted it is recommended to refrigerate and use within 28 days, although many use for much longer, as much as 2-3 months. (I would definitely use proper cleaning hands and area as well as cap before and after each pin).
It seems the consensus of most is to freeze while lyophilized and it will last years in a normal freezer (many say insulate if frost free).
Other peptides/stacks are different. I do not freeze NAD+ or LIPO-c
There is some debate on freezing reconstituted- I have seen a few say they do it, most do not.