- Stories I am currently reading and want to include to my list so I remember to pick up where I left off.
- Stories that are on hiatus and I want to know if they resume so I know if it is 'safe' to start reading.
- Stories that I think are really interesting and a tier above the usual stuff I put into the 'read later' list that I very rarely ever check.
But I will almost never read just one chapter and follow (unless there's only one chapter available, and I really loved it.)
I'll know if the novel is something I want to keep reading pretty fast; usually three to five chapters.
If I like it, I'll read until the latest chapter, and as long as I feel like I want more when I get there, I'll follow.
So the answer could be any of the above, I guess. Practically, it's after a month; mechanically, it's after the latest chapter; honestly, if I get five chapters in, I'm probably already following.
So its a follow after the first reading session if the story got me to want to finish it.