15 milliseconds * 2 (ping = round trip time) * 1.52 (~index of refraction in fiber) = 45.6ms straight line. Add in routing dilays and less than optimal paths a

15 milliseconds * 2 (ping = round trip time) * 1.52 (~index of refraction in fiber) = 45.6ms straight line. Add in routing dilays and less than optimal paths and your quickly hit 60-100 ms.