Hi DeusMechanicus!
In my observation it's a very context-based thing, and people make up rules for how a conversation will go on a case-by-case basis as the conversation is occurring. Some neurotypical people talk at greater length and in more detail than is strictly necessary, and depending on who they're talking to this will either be welcomed by their conversational partner or considered unnecessary overkill. The opposite can be true too (terseness could be either appreciated or a source of frustration). It seems mostly a game of chance of whether two conversational partners will appreciate each others' style. I would say then that it's not possible to come up with any hard-and-fast-rules about how much to say to people. Personally then I just recommend saying what you feel needs to be said and seeing what happens. A few reactions will be horrible, most'll probably be serviceable and some'll be great in a way you could never have anticipated. Just my take!