I think it definitely depends on the member and listener. Sometimes, a member just needs a short chat to avoid loneliness or to check in on their own health, but they could also need lots of time to sort through their own emotions and find detailed ways to work with their struggles. There are also some listeners who would prefer one time chats, and other listeners who are okay with someone going back to them for help.
So yeah, TLDR is that it really depends on the member and listener. And I'm honestly really glad the flexibility in the chat system allows that variety.