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Calculate Turn Around Times

I need to calculate turn around time between two sets of data reflecting both a starting date and time and obviously an ending date and time. This should reflect work hours meaning a day that starts at 08:00 and end at 16:30.

That would be a start and would be great if someone can show me how to calculate this.

But obviously people don't work on Sundays and only work from 08:00 to 12:00 on Saturdays... Can't even imagine how one would take this into account.

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a1 has 3/13/2009 (received date)
b1 has 7:08 AM (received time)
c1 has 3/13/2009 (completed date)
d1 has 9:08 AM (completed time)
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[url] ...

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