Video: How Long Is Tuna Salad Really Safe? Food Safety Guide https://youtube.com/watch?v=rAAOJNJJRdQ%3Ffeature%3Doembed The Cold, Hard Science Behind Spoilage Let’s talk bacteria. These little party crashers multiply fast — especially between 40°F and 140°F (a range scientists call the “danger zone”). That means leaving your tuna salad out on the counter for just a couple of hours can turn it into...