Time doesn't exist as an independent physical objective entity, it exists only as a measurement. Sometimes we represent that measurement with physical objects,

Time doesn't exist as an independent physical objective entity, it exists only as a measurement. Sometimes we represent that measurement with physical objects, such as with clocks or watches or in our heads (I can hold my breath for N seconds). It's no different than your height existing as a measurement, or the distance from here to the wall existing a measurement, or the distance of 10 meters existing. There are physical entities that exist within the measured space of course, the measurement entity as such does not exist (only in your head, or similar (eg in a computer), as a calculation). It's also the same as three apples and three oranges sitting on the table, and you multiply them to get the number nine - there is no new independent physical entity of nine objects created, other than the calculation as represented temporarily in your brain space (ie you're not able to manifest new tangible entities into physical reality this way, you can merely calculate and store the count as a computer by rearrangement). This is also why time travel backwards can't happen. There is no back there to go to, there is no saved record that some omnipotent entity is keeping track of. Backwards time travel requires either a fantasy premise of time (the mistaken notion that time is a separate, independent, physical thing and not a measurement), and or a god-like creature that has infinite energy to record the location of every unit of matter at every unit of time along with the ability to reassemble all of existence back to each save point - it gets comically silly fast for a rational person, you're better off believing in ghosts and the easter bunny.