In my (albeit limited) experience, there's slack in the workweek, and that slack can provide the required time to do random stuff.

I recognize this isn't true in organizations where everything is micromanaged, work time is tracked in hours or even minutes, and autonomy doesn't exist.

The more the employees are treated like responsible professionals, the more this is possible. And conversely, the more they're like factory workers behind a conveyor belt, the less this is possible.