Logic of Repeating layouts

I feel like this has been asked a bunch of times but I want to make sure I understand the logic correctly.

I have a layout comprised of two videos that play one after another.
Video 1 - 15:00
Video 2 - 20:00 +/- 2-3 min depending upon the months content.

I need that layout to play at 8:20 AM and start again 20 minutes after the hour, every hour for Fri-Sun.

Is this how I should be setting up the schedule?

Start Time - 07-27-2018, 8:20
End Time - 07-29-18, 20:20
Repeats - Hourly
Repeat Every -1
Until 07-29-2018, 20:20

It should be more like

Start Time - 07-27-2018, 08:20
End Time - 07-27-2018, 08:55
Repeats - Hourly
Repeat Every -1
Until 07-29-2018, 20:20

With the End Time adjusted for the +/- 2-3 depending on the week.

The way you had it, it would play all the time from 07-27-2018, 8:20
to 07-29-18, 20:20 additionally it would create a new event every hour.