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In physics tinetime is measured by clocks.

In the more refined version of the Special Theory of Relativity time is one component of the four-dimensional spacetime. One has a certain choice how to decompose spacetime into time and space. Hence the measured time depends on the choosen system of coordinates. There is no global time, each observer measures his own local time. But there are rules how to convert the different results.

But as you write, a term like "duration of time" is not employed in physics.

It is discussed in the philosophy of physics whether time flows or whether we move through a preexistent 4-dimensional spacetime. See "Chapter 5. The Frozen River. Does Time Flow?" from Greene, Brian: The Fabric of the Cosmos (2004)

My question: Who does speak about a duration of time?

In physics tine is measured by clocks.

In the more refined version of the Special Theory of Relativity time is one component of the four-dimensional spacetime. One has a certain choice how to decompose spacetime into time and space. Hence the measured time depends on the choosen system of coordinates. There is no global time, each observer measures his own local time. But there are rules how to convert the different results.

But as you write, a term like "duration of time" is not employed in physics.

It is discussed in the philosophy of physics whether time flows or whether we move through a preexistent 4-dimensional spacetime. See "Chapter 5. The Frozen River. Does Time Flow?" from Greene, Brian: The Fabric of the Cosmos (2004)

My question: Who does speak about a duration of time?

In physics time is measured by clocks.

In the more refined version of the Special Theory of Relativity time is one component of the four-dimensional spacetime. One has a certain choice how to decompose spacetime into time and space. Hence the measured time depends on the choosen system of coordinates. There is no global time, each observer measures his own local time. But there are rules how to convert the different results.

But as you write, a term like "duration of time" is not employed in physics.

It is discussed in the philosophy of physics whether time flows or whether we move through a preexistent 4-dimensional spacetime. See "Chapter 5. The Frozen River. Does Time Flow?" from Greene, Brian: The Fabric of the Cosmos (2004)

My question: Who does speak about a duration of time?

1
source | link

In physics tine is measured by clocks.

In the more refined version of the Special Theory of Relativity time is one component of the four-dimensional spacetime. One has a certain choice how to decompose spacetime into time and space. Hence the measured time depends on the choosen system of coordinates. There is no global time, each observer measures his own local time. But there are rules how to convert the different results.

But as you write, a term like "duration of time" is not employed in physics.

It is discussed in the philosophy of physics whether time flows or whether we move through a preexistent 4-dimensional spacetime. See "Chapter 5. The Frozen River. Does Time Flow?" from Greene, Brian: The Fabric of the Cosmos (2004)

My question: Who does speak about a duration of time?