I feel like I have tried everything, and I KNOW this is a simple task, for
those who are very familiar with Access, but I am having the biggest problems.

I have constructed a database to keep track of employees and also use the
dbase as a scheduling tool.  Basically, an employee's hours will be entered
by choosing a week-ending date (this was the best way I could think of), then
using 30-min. interval drop-down boxes to select the start and end times of
their shift.  The list box hails from a table I have made, formatted as
"date/time", "short time".

I also need to be able to calculate the hours scheduled for a shift (ex.  
7am to 3pm = hrs) and also total their weekly hours.  I want this to
autocalculate when the schedule data are being entered into a form.  From
what I gather, a query with hour totals for each day and a combined total #
hrs would work best.

BUT, I am having a horrible time constructing the queries - always receiving
error messages, and then when I don't receive an error message, the
calculations do not happen when I enter, say, 7am sunday start to 3 pm sunday
end.  I am not entirely familiar w/ Macros, VBA, or SQL, so if you provide
comments concerning those, please explain just a bit so I may understand.

Please help, I am sure this is elementary to most who are familiar with
access, but I am at the point of ripping my hair out over this, just kidding,
but it is stressful.  Help would be greatly appreciated!