Let's do some math! According to the SSH handshake described here[1], I believe there are 6 one-way trips. Given communication times according to this[2], we can average a one way trip to be about 11min.

6 trips x 11 min each: That is 66min for the handshake.

@_o

[1]: https://techieuniversity.com/ssh-work-flow/ [2]: https://www.mars-one.com/faq/technology/how-does-the-mars-ba...