This next part will give you an idea of how disorganized I am, but what the heck...
I had tested the Horned Melons to see how long I could store them at room temperature; that was in the article already.
But I just found another Horned Melon that had fallen behind something on a very unused part of my kitchen (behind the cookbooks). And, yep, it's still good. Do these things ever go bad?