Like many artificial human constructs, time itself does not exist in the classical sense of measuring seconds, minutes and hours. When exactly does the clock start and when does it stop? At what point was it decided that January first would take place on January first, and so on? Why does the clock start at 12am during midnight? Why can't 12am be closer to dawn? All of these demarcations are assigned at random and themselves hold no literal relevance, simply being where we establish the passage of time: a thing that does not inherently exist outside the minds of "civilized" ethnocentrisms.
Ken Wheeler famously said time exists merely as a measure of magnitudes. I will go slightly further and specify that time exists as a measuring of oscillating magnitudes. Where we can identify changes taking place and passing by, we call that time, like the growth of hair or movements of the stars or planets or Earth around the Sun.
Time does not exist, but for the minute physiological processes taking place on a biological level, what we refer to as "aging". Additionally, "time", or, the counting of "minutes", also does not exist in nature; therefore, "counting time" remains an artificial human-made construct that does not exist in the classical sense.
Through the process of intentional focus, yogis can slow their heart rate. As the yogi slows their heart rate by focusing the mind, their body's physiology also slows, thereby "slowing the passage of time", or, slowing the passage of biological metabolic processes. Time inside the yogi becomes malleable with the application of willful intent, unlike the watch on his wrist. Why?
There are many aspects to human living that are themselves unreal, though they are perceived to be quite real by the humans who leave the forest for the cities. For example, if you are late too often, you can lose your job. If you reach a certain age, you must act a certain way. Culture itself accepts the usage of time as a necessary implementation of so called "civilization". Putting on clothes, punching the clock at a menial job, participating in caffeine and drug abuse, religious wars, damage to ourselves and the environment: these are all a result of the artificial imposition of time, a profoundly inner unsettling of the greater subconscious we call civilization.