Apparently insulin can last at 87 degrees for up to a month. I am slightly confused on this topic as well, as I have a bottle of Humalog that I bought about 4 or 5 months ago, and haven't refrigerated it once. I keep my room ridiculously cool, multiple fans that are on all day (I sweat like a bitch so I keep my room icey haha) and I keep it in a dark cabinet away from any light or heat. I have been used it again recently and it still works. Yet everything I have read online tells me it shouldn't. Hmm.