I don't fully understand your questions except as to say you think that time is multi-dimensional and you wonder if time truly exists, at least in the way humans understand it. That would be very difficult to answer without further knowledge.
Scientists measure time on atomic scales relative to the speed of electrons and pulses they emit. We know that time exists as an element of reality through the patterns of nature (seasons, planets, life and death). Time is difficult to examine because it is such a basic concept, much like when ancient scientists turned their attention on their own breathing and added an extra dimension to their self-awareness.
Humans don't have a definitive lock on the characteristics of time and all of what time is. We know that time is linear in our dimension, but maybe, time isn't linear in other dimensions, and if so, in a dimension of non-linear time, how could one exist? It get too abstract to comprehend. But we do know, through the examination of great measurements of space, that time is subjective to speed and gravity and possibly other factors of existence.
