I personally prefer using Target Points, and Ease nodes to ease between them. It’s much more visual for you in the viewport, you know exactly the start and end points of your movement.
As for the timeline, like Sir Unfathomable said, it’s 0 to 1, since you use it as Alpha for the Ease node, and if you set the time for the curve points to 0 and 1 as well, it will be very easy to set the time for your movement by simply setting the timeline play rate, like 0.2 for 5 seconds, etc.