how many users my linode may serve at the same time?

I can destroy a 512 single-handedly, so let's say two users.

There is no such thing as a "user"; there's just some number of simultaneous requests. For example, right now, I am "using" forum.linode.com, but I am using absolutely() no resources. When I hit "Submit"(*), I'll be hitting that thing like an old band saw for a second or so, but that's it.

See my other post yesterday for applicable advice on things to measure.

(*) OK, so there's a session cookie in a database somewhere. I'm not going to insult Linode's staff by implying this is an overwhelming burden.

(**) Assuming I don't hit Perview first, which is a valid assumtion.