We could leave in High School, but the school I went to followed a modular schedule like what you would have in college. Some days my classes were over at noon. Others I didn't have to be there till 10 or 11.
My kids schools have salad bars. They like that option when the school has something they don't want. Mine complain that their meat sauce for spaghetti is the same thing they put on tacos and use in hot dog chili. (aka hot dog sauce to our Yankee friends)