Does Time Exist?

Is there time absolute, relative, or per se?
Does time exist where there is no matter?
Is time a consequence, dimension and measurement of movement and activity (kinesis), and change?
Is time a need of the observer’s mind to perceive the sequence of phenomena and/or actions? To distinguish first (prior, former) and second (next, posterior) etc?
How is time comprehended (felt) by inhabitants on different planets, or in space? For example 10 hours on Earth are the same on Mars, longer or shorter?