I made a sandwich two days ago that consists of white bread and canned tuna. I put it in my freezer immediately after making it and it stayed there until today. This morning I took it to work, planning to eat it for lunch, but am now going out for lunch instead. I'd rather not waste the sandwich, so is it safe to refreeze it until tomorrow? It has been out of the freezer for 5 hours and sitting in my desk drawer.