[Aristoddler]

Here's a thought.

Two things that we assume in our existence to be unwavering are the speed of light and the speed of time.

Light continues in a path until something opaque blocks it, or something translucent refracts it and dilutes it to the point where it is no longer tangible.

Time continues as long as existence continues, since time is indirectly a measurement of existence.
Existence by definition is the state of exist.

Time = Exist.
Light < Time.

Tangents aside...

Our only tangible method of determining the length of a unit of time is something that exists inside of time. This makes it biased according to its' own existence.
A second is measured by something physical, in an effort to measure something intangible.
It's like trying to use a physical device to measure love. You can't do it. The statement, "My love is seven meters thicker for you than it was yesterday," is impossible to draw a conclusion from...it's inane.

Take a piece of string that is a foot long, and take another that is an inch long. By visual comparison you can tell that they are obviously different lengths.
However if you take an hour of time from the pockets of the universe and a minute of time from another pocket of the universe, then who is to say that the length of time is uniform?

Light is a beam. Sound is a wave.
Who is to say that time is any different than sound is? Or a meandering river, for a more illustrious example.

If I am driving a car and you are my passenger; you cannot tell what speed we are moving by simple feel alone. I can accelerate and decelerate at my leisure without you noticing.

If time is the driver, and exist is the car...then where is the proof that time is not accelerating and decelerating at its' own leisure, or even linear for that matter?

Non-Linear time.
I can drive my car down Centre Street, past 1st avenue, 2nd, 3rd and 4th.
This is how we assume time travels. A straight tangent.
I can also drive my car down Cantre St, turn on 1st, drive up Laurier St, turn back to Centre, and down Chrysler Crescent to bypass 2nd without seeing it, and end up on 3rd before driving to 4th.
This is non-linear, and how time could travel.

Now to take it a step further even...

Non-linear time moving at a faster/different rate that linear time moves at, could theoretically be how time moves.
But since we're only passengers, we can't tell.