How does the Fornax Science Console decide when to cull servers?

[vandesai1]

The Fornax Science Console will cull servers after a user is inactive for a certain amount of time. Add how long.

[jkrick]

There is a 1 hour default timeout on the system.

More specific questions from a slack thread with @troyraen and @sawdog

1. What event(s) starts the timer for the 1 hour cull timeout?
2. Is there any guaranteed (or reasonably expected) minimum amount of time that the user’s computer can be disconnected from the session/server before the server is subject to being shut down?
3. Is there any requirement for the human user to be interacting with the session (typing or clicking), or is it enough for the computer to simply maintain a connection?
4. Does it matter at all how “active” the actual code is? If so, does this have to do with percentage of time it’s using a CPU vs just waiting for data to come in, some threshold on the load average, and/or something else?