The animation timeline (in the Timeline window) shows you how long each stage in an animation is scheduled to last. The numbers at the top of the timeline are seconds.
Note: Each marks one stage of an animation.
To start an animation immediately upon activating its trigger, the red section must begin all the way to the left (as shown on bathtime.jpg).
To start an animation after activating its trigger, click and drag the first to the corresponding starting second (as shown on celtic_avatar.jpg - this animation is slated to start at 2 seconds).
To extend a stage of the animation, click and drag the stage's last to the desired finish time.