I cant use Clock or embedded code

Everything you add to a layout (image, video, embedded, etc) can have specified duration.

Layout will reload (or move to next layout) after the region with the longest duration end.
So if you add some long durations on items on your layout, then it will delay any changes / next layout etc.

Ok. So media duration = layout duration?

Can I add transitions between layouts in campaigns? There’s a little “lag” effect in clock (looks like a restart effect) when changing layouts.