First and foremost, Americans are punctual, if not absolutely ruled by the clock. If the theater show starts at 7:30 pm, the majority of Americans are expected to be in their seats 20 minutes prior. Crawling in the dark over other patrons to reach your seat even five minutes after the curtain has risen will cause grumbles. You might even be forbidden to enter by the theater ushers who will force you to wait until a suitable break in the show. Time sensitivity extends to dinner reservations at local restaurants, as well, whether or not you are meeting any Americans. A mere 30-minute delay will push you to the end of the reservation list at bustling, popular eateries. Dining with Americans at their home is only slightly less restrictive. The hostess will fret over her perfectly timed meal when you don't arrive at the appointed hour, but you are allowed a 15-minute leeway, which is considered "fashionably late".