Have you looked at our V2 series of CMS, with our most recent being v2.3.1? In this series we have added Playlists as well as Expiry dates so you can set start and end times for Widgets!
You could create a Playlist with your images and have those show every 10 seconds set with Expiry dates so that they won’t show until the start date/time has begun and will be removed from the list on expiry, so no need to create multiple Layouts with hefty scheduling!
Do have a look at the following guide which highlights some of the features and changes you can expect in v2.3 here:Improved Layout Designer in 2.3.0-alpha or sign up for a free cloud demo to take a closer look: https://xibo.org.uk/hosting