Hi! I've been searching for this too and found an easier way to get the data I'm looking for. Maybe it will work for you too?

Go to the Reports menu.
Click Jobs, Time & Mileage, then select Time by Name.
Set the date range.
Under Columns, I chose "week"

I then collapsed the rows to only get the weekly totals. (We have project data in there, you may not need to do that.)
Click Refresh.

I now have this set up as a memorized report. 

Not sure if that works for your data or not, but thought I would share!