To calculate the distance traveled by a signal in 1 millisecond, you need to know the speed of the signal. The speed of the signal depends on the nature of the signal and the medium through which it is traveling.
If the signal is an electromagnetic wave, such as radio waves or light, in a vacuum or air, it travels at the speed of light, which is approximately 299,792,458 meters per second (m/s).
To calculate the