I'd raise that to 24 hours, but you're right. I know two people like that. One just lets messages pile up until they feel like responding, which can take up to a month. Another straight up told me they have so much incoming messages that they have no hope of ever going throughб so if I wanted to reach themб I should keep messaging them like every few minutes to keep the dialogue up in the list. I'd say that's just a poor communications hygiene. Suffice to say I don't really talk to either of them anymore. I know smalltalk isn't urgent, but I cant see it as a dialogue anymore if it goes slower than a message/day.