Excel holds dates and times in numbers, so what you are after seems like
a simple subtraction.

days_open = create_date - resolve_date

But...

what about weekends and holidays? Answer use
NetWorkDay(create_date, resolve_date, holiday_range)

Note that the same day returns a value of 1, so if you need to add 10
hours for each day the number of hours to add would be:

=((NetWorkDay(create_date, resolve_date, holiday_range)-1)*10

The time can be a simple subtraction

hours_open = resolve_time - create_time

This returns a fraction of a day (0.041667 = 1 hour) so multiply by 24
to return hours.

hence the formulae you are after, in the cell, is:

=((NetWorkDay(create_date, resolve_date, holiday_range)-1)*10) +
((resolve_time - create_time)*24)

HTH

Art

P.S.
I would but validation (menu DataValidation) rules on the cell ranges
to make sure you don't enter dates and times in invalid formats.


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