Just for nitpicking, light doesn't travel the same speed in fiber as in vacuum. AFAIK the refraction index of the core is typically ~1.45 so your latency is "on

Just for nitpicking, light doesn't travel the same speed in fiber as in vacuum. AFAIK the refraction index of the core is typically ~1.45 so your latency is "only" around 8 times larger than the theoretical limit.