You are much better at explaining it than I am. But I do understand it.

The start and endpoint are the same, but the experience in between is different for the two. Longer or shorter.

An analogy if I may.

I go to bed at 10pm and my wife sits in a chair awake. Time for her lags, and I sleep until 8am. When I wake up, it almost seems instantaneous, but for her, it seemed like forever.

(I know it isn't the same thing.. just stating the way it is relative)