This is a very important property in the world of WPF animations, as it specifies how long the animation will last.
The property is actually of type Duration.
What does that mean?
Well, in addition to being able to specify every thing that a TimeSpan can specify – like hours, minutes or seconds – you can also specify two special values:
Automatic – sets the animation to be 1 second
Forever – does what it says on the tin , runs the animation forever
