Time: U.S. Americans take pride in making the best use of their time. In the business world, "time is money". Being "on time" for class, an appointment, or for dinner with your host family is important. U.S. Americans apologize if they are late. Some instructors give demerits to students who are late to class, and students at most universities have institutional permission to leave the classroom if their instructor is 10 or 15 minutes late.