Hi mrcog,
There is a work around using a custom duration field and a custom calendar.
Create a new calendar (Tools>Change Working Time). Copy the Standard
calendar, name it (I used 7Day) and make Saturdays & Sundays working days.
Then insert a custom duration field ([Duration1] for example) in the task
table. Choose Tools>Customize Fields and select the [Duration1] field.
Click the Formula... button and use the following formula:
ProjDateDiff([Start],[Finish],"7Day")
In the Customize fields dialog box, click the Use Formula option for the
task and group summary rows.
This will calculate the number of calendar days between the start of the
task and the finish of the task using the 7Day calendar. .
Hope this helps. Let us know how you get along.
Julie