Settings, Opening hours sets an open and a close time for each weekday, and names the saved playlist the room plays. At the open time the room opens that file and starts it from the top on Loop all; at the close time it cuts to black. A day can be left off, and a window may run past midnight: 20:00 to 01:00 is one window.
The schedule fires on boundaries, not continuously. If you black out or take a clip by hand during opening hours, it holds until the next open or close rather than being overridden seconds later. Launching the app inside a window starts the room straight away.
Start with this Mac
Under the same tab, Start with this Mac makes Sialk Player a login item. A room whose Mac logs in by itself comes back after a power cut or a cleaner's switch, and the schedule takes it from there. It takes effect in the installed application.
With the Mac set to log in automatically and this switch on, the room needs nobody in the morning.