How the notification becomes visible on the screen can be controlled with the Animation property. Possible values are:
You can define how long the animation will take by setting the AnimationDuration property. Its value is set in milliseconds. This property takes effect only if the Animation property is set to a value, different than None (which is the default). The default value of the AnimationDuration property itself is 500 milliseconds.
For a live demonstration showing notifications with all possible combinations of values see the Notification Configurator Live Demo.