In my experience calls rarely have a definite end. "Quick" calls often turn into 30 minutes or an hour of the colleague talking about things unrelated to the is

In my experience calls rarely have a definite end. "Quick" calls often turn into 30 minutes or an hour of the colleague talking about things unrelated to the issue they wanted to discuss originally. In the office I've had people sit at a desk next to me and just talk at me for more than an hour about themselves. Trying to politely end these kinds of conversations just results in a brief blip in their monologue before they go back to it. I've even had to get up and walk away after someone wouldn't stop talking at me. For whatever reason there are many people who are incapable of thinking about how they're using other peoples' time. The only defense is asynchronous media like chats or emails where you aren't forced by social politeness into continuing to be disrupted.