Animation Speed

When you create a new keyframe, it defaults to having a period of half a second. So the animation from that keyframe to the next will take half a second. The longer you set the period, the slower the animation. To set the frame period for any frame, first select the desired frame in the Frame Gallery (click on it), and then click the Animation Properties button (or just double click the frame name).

Setting "Display This Frame For" to 2 seconds means the animation will take 2 seconds to tween from this key frame to the next.

Note: The Animation Properties dialog is non-modal and you can keep this on screen all the time. By pressing the Apply button instead of OK, the dialog remains on screen. Its contents are updated as you select different frames, and for each of them you can set the required display period.