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kotlinlang

You need some queueing theory to answer your question. You are describing an M/M/c queue.
<https://en.m.wikipedia.org/wiki/M/M/c_queue|https://en.m.wikipedia.org/wiki/M/M/c_queue>

You can calculate what will happen: 
<https://www.supositorio.com/rcalc/rcalclite.htm|https://www.supositorio.com/rcalc/rcalclite.htm>

I'm not sure that serializing a request into a response and executing it in a client is a terribly common model. I'm curious how it could be useful...