I didn't mention interval of time. A time interval of 1 second is a duration of time. Duration is measured with a clock. A clock doesn't create duration, it measures duration. Just like a ruler measures the length of a stick. The length of a stick is the thing being measured, and the ruler is the measuring device. You can't claim the stick's length is the same as the ruler that is measuring the stick. They are two different things, the thing being measured (stick) and the measuring device (the ruler.) It's the same thing with duration (the stick) and the clock (the ruler). A clock is MEASURING duration. The clock is not duration like a ruler is not the length of the stick. Does the stick have length is there is no ruler??