Returns the length of a single iteration of this AnimationTimeline.
Assembly: PresentationCore (in PresentationCore.dll)
This method provides the implementation for GetNaturalDuration and should not be called directly from your code.Notes to Implementers
This method should be implemented by classes that need to provide a custom natural Duration when the Duration property is set to Automatic. If the natural duration cannot be determined, this method should return Automatic.