How do I find a stat Info for Layouts?

Hi all;

I am looking for the DB read time for layout while executing everytime for last 2 months. Our layouts run via portal; there is link on the portal and the planner just go to the link and open the layouts and entered their plan data. I tried followings:

T-code: STAD gives me the exact format of data I need but I see only the data for today and don't have it for last two months.

Table UPC_STATISTIC3: not sure ...what am I doing wrong...can't get in DB read time.

Any idea....could someone pls explain me the steps...thanks...