I've been in teams where standups are short and to the point, and in teams where they drag on for way too long.

A few elements that I think contribute to long standups:

* A very large team (I've been in a marged team of 14 people once...)

* Getting too much into technical details: don't do that; have your technical discussions after the standup with only the relevant people

* People sharing their opinion (frustration) about blocking issues and that developing into a discussion. Again, leave it until after the standup.

When standups drag on for too long, it's time for the scrum master to step in and get people to keep it short.