When it comes to storing food, many of us follow the practices our parents and grandparents used. Who cares about reading the package instructions when Grandma left her butter in the butter bell all day, every day, right? So, maybe your butter's home is on the counter in a dish. Or if not on the counter at all times, perhaps you leave your butter sitting out overnight to soften before baking. But, should you leave butter sitting out, unrefrigerated? And, if so, how long can it be on the counter before it becomes unsafe to eat? We asked the experts...