The game begins with a cutscene with Joanna, followed by a long conversation with Joanna, which has 6-8 points where you pick from 2-3 dialogue options. There are over 100 ways the conversation can go.
A lot of the same options reappear, so by replaying this part of the game a lot, I was able to get a sense of how to go through it quickly. For example, it's faster to talk about Henrik than it is to talk about glyphs, and it's faster to talk about the monolith directly, as opposed to talking about Alejandro or buying the monolith, which are both conversations which circle back to the monolith.
Joanna has TWO conversations about the monolith, actually. The shorter one is "It's a massive pillar of stone, nearly 1500 years old..." while the other one talks about the excavation team, and it's usually paired with Joanna's "in addition to our permanent collection..." line.
If you start with Option 1, Joanna will always say "Anyway" as a transition to the end of the conversation. That doesn't happen if you start with Option 2, about Nancy's father.
I think the fastest way through the Joanna conversation is to pick options 2-1-1-3-1-1.