I see, so sharing makes it a bit complex as workspace can display maximum of 200 rows in a breakdown and it exports only the part the is displayed on the screen.
Since your requirement is 5 minutes before and 15 minutes after the TV spot, that would be limited within a particular hour.
So what you can do is to first breakdown the page by hour and then further breakdown the hour of your TV spot by minutes, that would give you the 60 rows that you are concerned about. Here is a sample screengrab.

I hope this helps.
P.S I like the Mercedes G-Wagon in your profile picture.