Use timers in Screens and Aux. Screens
Timers can be assigned to image slots. They can then be used in layers just like regular images.
In 
Images⚓
Click an image slot.
The image slot settings are displayed.
In Identification > Label, enter a label to rename the Image slot.
In Option, enable Allow downscale to resize the image when the image slot capacity is too low for the image resolution.
In Content, select a timer to be used in this image slot.
The selected timer is now loaded as an image slot and is ready to be displayed in layers.
Tip :
Timers can be displayed in Multiviewers without being assigned as image slots.