You now have a Graph for the period you set at the beginning of the script... If you change the period, you only see it in 1 graph the whole period.

What I like to see is a period of 1 week grouped per day, and every day below each other.

I have a few daily jobs. If the day starts at 0:00 and ends at 23:59 then you can see if jobs running slower at a certain point of time... and If you want to plan an new Job you can see which timeslots are free...