Beer drinkers who are new to wine get this one mixed up all the time. A case of wine is 12 bottles, not 24. FYI, a winery's total production is usually measured in cases. The midsize Ravenswood Winery in Sonoma Valley, for example, produces about 150,000 cases a year, whereas larger wineries such as Sebastiani Vineyards crank out six million cases annually.