And how many rooms of my house do you suggest devoting to storage for them? In my experience if you hold on to them they tend to accumulate rather quickly and only a handful, at most, are ever being actively “re-used”.
I expect if it really took 18 days, then no, the gel would not still be frozen. I have no way of knowing though since it’s more like a max of two to four days before they show up in my case. (From a VA pharmacy distribution center in Illinois IIRC).
But as always, I worry a lot more about the insulin freezing than I do about it getting warm, especially as this time of year approaches. I just ordered a refill because I’d rather it shipped while the days were still “warm”.