The experts at Wine Folly have answered an important question: how much time do you have to finish an open bottle of wine before it turns to vinegar? As you'll see in the handy chart they made below, sparkling wine pretty much needs to be consumed on the spot, reds and whites have five days max, and rosés got a week. But the good news is you can hang onto that fortified stuff for a solid month. (Unsurprisingly, Franzia also lasts that long.) No wonder Thomas Jefferson loved Madeira so much.