Maybe I don't get the question, but it seems to me that squares and cubes are nothing more than mathmatical models, and nothing will get one to change into the other.
Now if you're trying to visualize time as another dimension so as to draw it on a piece of paper, then I suppose one could say that after a certain amount of time the length along the "time axis" might be conveniently expressed as a segment a meter long, and that length of time is your answer. But that seems to me such an "abstraction of an abstraction" as to lose all meaning. And of course it depends on how you scale your graph, and what the actual "speed of time" is.
Maybe that's a different way of phrasing your original question: "what is the speed of time?" In that case, the speed of light is an attractive answer but I have no idea how one would come to such a determination. And even that might be too abstract a question to try and solve using conversational English as opposed to lots and lots of very hard math.
