I'm surprised to see lots of comments with managers meeting their direct reports for 30 minutes per week...assuming 10 reports, thats 5 hours a week... Or basically 1 hour per day just to talk about someone's career.

My manager blocks off 2 hours per week. If you have something to talk about, put a meeting on his calendar. The only obligation is the semi annual 1:1.

I talk to my manager on a daily basis so any 1:1 is really for career path, no project status, gripes about people, etc.