Report Builder Help Setup Time Report

I am looking for what I believe to be a simple report to look at gross
setup time by work center. I have a basic idea of how to start the
report but not sure how to capture the end date and start date by work
centers when the dates may very by weeks or months. We are looking for
different measures to help understand machine utilization.

Our definition for setup time is: the time from the completion of the
last good production part (part A) to the completion of the first good
production part (part B).

I am looking for a Report Builder report that will give me setup time
by WCC and an accumulated setup time for the plant. Does any one have
a report that you would like to share?