Comment by crazygringo

The problem is that final decisions tend to be made in the last 30 seconds of a meeting. If you're a manager with a stake in the outcome, you can't leave the meeting until you've ensured that the outcome works for you. Leaving 5 min early is often simply not an option. While arriving 5 minutes late is. It's not an ego thing -- it's the fact that meeting leaders often let meetings run long.