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> any request from a user requires a total of 2 [sequential] round way trips (one for request, one for response)

Please elaborate? This makes no sense to me. Certainly, this is not the case for terrestrial communication (request/response latency is only 2× the one-way latency).

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By "one way" the OP was referring to the ground-to-satellite trip taking 110ms. So by "round way trip" they meant a packet going from client to satellite to ground station (2 x 110ms). Thus 440ms.

OH. Of course, that makes sense. Thanks!

How long until we can co-locate application services in geosynchronous orbit to cut that latency in half?

Possibly they were thinking of first a DNS query then the actual query? That would result in two round trips.

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