Hold up. You threw a turd over the wall and asked "what makes you think Man can tell time?". What makes you think we can't?
Even if time doesn't exist as we perceive it, we are still measuring something. It's also worth noting, time is relative to how fast one is moving in relation to something else. It also works the same way as space. So I agree the time we experience as a series of moments moving from the future, to the present, to the past is only an illusion of what it really happening (Einstein has a lot to say about this). This can even be observed in clocks on satellites in orbit moving at extremely fast speeds.
However, that doesn't take away from the fact that we are measuring something in relation to something else. In relation to where we are now, the end of precambrian period represents about 600 million trips around the sun ago.
So, not sure what your point was.