Time is not an artificial construct. Einstein showed that with his theory of special relativity, and more interestingly, he also showed that it's not being run from a "centralised node".
The "relativity" in the name of the theory talks to that, which is to say, time is not experienced equally by everything at the same rate. The rate at which time passes depends entirely on your frame of reference (or more broadly speaking, things in heavy gravity wells or moving close to the speed of light experience time at a different rate to those observing them.