31.   An unspecified flaw at a computer center shut down the Nasdaq Stock Market for a quarter of an hour at the end of the session.

32.   And in between, they spend hours at the warehouse where the search continues and the fire still burns.

33.   And it acts as a preservative, extending the life of the masa, which can sour within hours at room temperature.

34.   And to think it all happened in a little more than three hours at Jack Murphy Stadium on Sunday.

35.   And the pressure to get into a good high school means that children spend hours at cram schools to pass tests with high scores.

36.   And unlike last year, the tally sheets did not disappear mysteriously for hours at a time between the voting places and the computer centers.

37.   Another reality is that employees are now more likely to find romance at work because so many are spending longer and longer hours at work.

38.   Anything that might spoil the illusion was kept out of sight, allowing visitors to suspend disbelief for hours at a time.

39.   Another way to avoid this problem is to specifically train your pet to stay in a crate or airline carrier for several hours at a time.

40.   And, of course, swinging for hours at a time on a tire swing is one of my favorite forms of recreation.