Let's start with one of the most subtle and interesting new meetings you're likely to encounter as a manager. Even though you spend most of your workday in the office or "on duty", there are going to be times when you chat informally outside of regular office hours and the office environment.
Whether you count this as "work" is entirely your personal choice and it is different for everyone. What isn't disputed is that your interactions with your team, your manager, your peers, your wider colleagues, and your stakeholders, all matter, whether you're on duty or off duty.
We can usefully split off-duty chats into two categories. The first of these categories is when you're just with your team, while the second is when you're talking to everyone else. The reason for having two categories is that your role is different...