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The U.S. Department of Agriculture recommends children ages 9 and older and adults consume at least 3 cups from the dairy group each day. Active teenagers with high calorie requirements of 3,000 calories or more may require 4 cups from the dairy group each day.
If one considers nowadays recommendations - USDA, Harvard - an adult shouldn't drink more than 3 glasses a day, e.g. 3 servings of: 1 cup / 8 fl oz / 240 mL. [Serving sizes: Section 101.12 - Reference amounts customarily consumed per eating occasion. Page on gpo.gov] However, one has to think about 3 Dairy Servings.