Can you clarify what you mean by that?
Light travels at about 69% of the speed of light through fibre optic cable. That's through a straight cable without any hops, excluding any receiving / transmitting hardware on either end.
It ca go faster, but not practical for long distances
So for long distances the speed barrier is 0.483 ms per 100 km. The distance isn't the real issue, the amount of hops the connection goes through is what adds latency. That together with bandwidth (affects time to transmit each frame) and stability (judder)