In Stardew Valley, one of the main objectives is to make friends with as many of the villagers as possible. One way to do this is by talking to them every day. As per the wiki, speaking with other villagers earns you 20 friendship points per person per day.
Usually, once you've talked to a villager for the day, you will be unable to talk to them again for the rest of the day (the speech bubble icon will not appear when mousing over them). However, some villagers will occasionally have multi-part dialogs, where you can talk to them a few times in a row as they elaborate on things they just said (for example, Penny explaining how it's difficult to keep her house clean without help from her drunken mother, a conversation which consists of 4 distinct dialogs, each of which you have to re-click on Penny for). My question is, do you get the full 20 points immediately after the first dialog, or do you have to finish the full conversation to get the points?