I am doing research for my thesis. This involved putting a survey on
the Internet. Some people responded to the survey in less than 30
seconds, and I want to delete these participants because they probably
did not read the questions.

Column A1 lists when they began the survey and column A2 lists when
they finished the survey:

A1 A2
August 19, 2004, 7:19:35 PM August 19, 2004, 7:23:27 PM
August 19, 2004, 7:45:47 PM August 19, 2004, 7:47:04 PM
August 19, 2004, 8:30:31 PM August 19, 2004, 8:31:22 PM
August 19, 2004, 8:44:12 PM August 19, 2004, 8:44:32 PM
August 19, 2004, 8:46:12 PM August 19, 2004, 8:47:16 PM


I would like to identify cases where the partipant took less than 30
seconds, so the output might have 1s if it's okay and 0s if it
doesn't:

A1 A2
A3
August 19, 2004, 7:19:35 PM August 19, 2004, 7:23:27 PM 1
August 19, 2004, 7:45:47 PM August 19, 2004, 7:47:04 PM 1
August 19, 2004, 8:30:31 PM August 19, 2004, 8:31:22 PM 1
August 19, 2004, 8:44:12 PM August 19, 2004, 8:44:32 PM 0
August 19, 2004, 8:46:12 PM August 19, 2004, 8:47:16 PM 1

Is there any way to do this? I realize that it's complicated but I
have 2000 participants and I don't want to do it by hand!

Thank you!


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