21.   The blasts raised giant clouds of thick black smoke that lingered for hours over the battlefield.

22.   The program does save me hours over the time I once spent with a hand-held financial analysis calculator.

23.   Then her motorcade cruised through the snowy streets of Washington to her home in the Georgetown section, where their talks continued for another hour over lunch.

24.   To gain a few hours over regular jets, you had to travel on a plane that was swiftly becoming a museum piece of aeronautics.

25.   Tracy decided to put in extra hours over the weekend so that it was ready for the boss first thing Monday.

26.   We would sit for hours over red wine in Paris screaming at one another about where comedy comes from.

27.   Year-round training and ever earlier starts mean greater total practice hours over a lifetime.

28.   Your family and guests will think you labored for hours over this cake-like bread.

29.   Zoo staffers have spent literally hundreds of hours over several years to get the animal comfortable with the restraint and the touch of human hands.

30.   Partly cloudy skies with isolated showers prevailed during the morning hours over Puerto Rico and the U.S Virgin Islands.