When casting speed stays the same, the pause gets longer as the line gets longer: expect a longer pause at 45 ft than at 20 ft.

The Fifth Essential says the pause between casting strokes varies in duration with the amount of line outside the rod tip. Two things set that duration — line length and line speed. Hold speed constant and only length is left, so the longer line takes longer to straighten. Start each stroke when the line and leader are almost but not quite straight. Too short a pause and the line has not unrolled, giving slack and a whipcrack or an undulating line; too long and the line falls and ticks.

Distance also changes trajectory. At 20 ft the pitch is steep, up in back and down in front; at 45 ft it is shallower, with loops kept to 4 ft or less.

Source

From the Fifth Essential and the trajectory section of the CI Study Guide (2025) (PDF), and Task 21’s rule that the pause needs to be longer as the cast lengthens; terms from the FFI Fly Casting Definitions (Pause, Trajectory). See also Task 12, accuracy on-side.