the ambient screen should also have the time to set the user for how long the notifications need on his screen.
It should be possible to set the notification display time (5, 10, 15 seconds, etc.), as well as define how long the reminder should be active (1,2,3 hours etc.)
But there is not Ambient Screen option on Nougat ...are you running Oreo Beta already?
It looks like you're new here. If you want to get involved, click one of these buttons!