How to set up the data range is last 8 weeks in Adobe Analytics (auto rolling) week from monday to sunday?
have a look here: Create custom date ranges
for your question: create a new time range with the following conditions:
Start: start of this week minus 9 weeks
End: end of this week minus 1 week
be careful: this condition has the same start/end week day as your settings of the report suite. if your RS does start on sunday, the time range is sunday to saturday!
hope that helps, regards urs