>>16711917 (OP)To break down a dual coordinate system of an axis that results in a differential of space or time, creates the need for implied motion.
Let's make this more sensible and just replace space and time with axis vector 1 and axis vector 2.
A differential to resolve differences between V1 and V2 must exist, to give each identity unique against the other.
There is no grand reference frame separating these things with an identity.
The implied difference, in the case of space and time is motion, but motion in our V1-V2 line, is not movement between points, but the only metric we have to compare V1 and V2.
How many seconds are in a kilometer?
Answering this question with accuracy, per human knowledge at this point, you would calculate a light kilometer.
Why?
Light is the maximum limit of identifiers allowed between the V1-V2 comparison.
>It's the most raw form of motion for space-time comparison.If we can genuinely break it down further, we don't know how yet.
Only higher order hypotheticals exist in the land of comparing space and time, beyond the light barriers.
So, study the box as we see it today, or try to predict what we might find out about the box tomorrow.
Either way, with space and time, the comparative differential that "works" is using light as our base motion reference.
If it's all strings, or branes, or higher dimensional manifolds, or God, whatever... We don't actually know any of that yet, so the answer for you is a light kilometer.