Duration is not necessarily an independent entity existing separately from everything that happens. In practical and physical descriptions, it appears as a way of comparing changes.
A Measure Is Needed
The phrase “this lasted a long time” has no complete meaning without specifying a scale. Process A may change once during a period in which process B changes a billion times. In that case, the duration of one process is described through another.
Clocks do not reveal a ready-made duration as a thing. They establish a reproducible procedure for comparison: between events, a selected mechanism completed a certain number of cycles.
Duration is a measured relation between events and a process accepted as a measure.
Speed Does Not Exist Without Comparison
One cannot ask about the “true speed” of a process without specifying what it is determined relative to. This does not mean that all descriptions are equally correct. Stable clocks, physical laws, and agreed-upon procedures provide reliable relations between processes.
But the reliability of a relation does not automatically turn it into an independent substance. A billion years is not a separate object inside the Universe, but a designation for a particular scale of measurement.
Physical and Phenomenological Description
Physics can describe the interval between events without referring to how that interval was experienced. Phenomenology, by contrast, investigates how a subject holds the past, the present, and anticipation of the future.
These two descriptions need not compete. They answer different questions:
- physics: which relations between processes are reproducible;
- phenomenology: how duration is given to an experiencing subject;
- practice: which possibilities a subject can realize within a limited interval.
The Limit of an Objective Thesis
The assertion “without a subject, there is no experienced duration” is relatively clear. The assertion “without a subject, there is no time at all” is much stronger and requires separate justification.
If one removes the subject and every scale, changes, sequences, and causal connections remain. But whether these can be called time, or whether it is more precise to speak only of relations between processes, becomes debatable.
The objectivity of measurement is not identical to the independence of time as an entity.
Conclusion
It is useful to understand duration as a level of organization of changes: it arises where processes are compared against a stable measure. The question of whether this structure is a fundamental property of reality or a way of describing it should be left open and not confused with the question of experienced time.
