0.3 seconds would not be surprising. The calculator you're using doesn't take into account: 1. The speed of light in a fiber is only 2/3 the speed of light in

0.3 seconds would not be surprising. The calculator you're using doesn't take into account: 1. The speed of light in a fiber is only 2/3 the speed of light in a vacuum (look it up) 2. Internet routes are far from a straight line, especially for international communication. The network distance is a multiple of the physical distance 3. Most protocols require more than one roundtrip per communication (because most protocols are implemented on local networks and the designers never notice extra roundtrips creeping in) The last of these is very unfortunate but true