In physics, the Planck time, (tP), is the unit of time in the system of natural units known as Planck units. It is the time required for light to travel, in a vacuum, a distance of 1 Planck length.
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The Planck time is the unique combination of the gravitational constant G, the relativity constant c, and the quantum constant h, to produce a constant with units of time. All scientific experiments and human experiences happen over billions of billions of billions of Planck times, making any events happening at the Planck scale hard to detect.
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Pink Floyd - Time
Ticking away the moments that make up a dull day
You fritter and waste the hours in an offhand way.
Kicking around on a piece of ground in your home town
Waiting for someone or something to show you the way.
Tired of lying in the sunshine staying home to watch the rain.
You are young and life is long and there is time to kill today.
And then one day you find ten years have got behind you.
No one told you when to run, you missed the starting gun.
So you run and you run to catch up with the sun but it's sinking
Racing around to come up behind you again.
The sun is the same in a relative way but you're older,
Shorter of breath and one day closer to death.
Every year is getting shorter never seem to find the time.
Plans that either come to naught or half a page of scribbled lines
Hanging on in quiet desperation is the English way
The time is gone, the song is over,
Thought I'd something more to say.
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The Alan Parsons Project - Time
Time, flowing like a river
Time, beckoning me
Who knows when we shall meet again
If ever
But time
Keeps flowing like a river
To the sea
Goodbye my love, Maybe for forever
Goodbye my love, The tide waits for me
Who knows when we shall meet again
If ever
But time
Keeps flowing like a river (on and on)
To the sea, to the sea
Till it's gone forever
Gone forever
Gone forevermore
Goodbye my friends, Maybe forever
Goodbye my friends, The stars wait for me
Who knows where we shall meet again
If ever
But time
Keeps flowing like a river (on and on)
To the sea, to the sea
Till it's gone forever
Gone forever
Gone forevermore
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Time Illusion?
The illusion of time
(From the documentary "The Fabric of The Cosmos")