Speed of light is (roughly) 1 ns per foot. Your problem won't be latency, but signal degredation. Standard Ethernet uses twisted pair copper wire, most of the time good quality cables can only go about 100m before having signal issues. cheap cables will degrade over shorter runs.

So get some decent Cat 5e or Cat6 cable for this, even if your run is only a few 10s of meters.

https://www.diffen.com/difference/Cat5e_vs_Cat6