Both of the renditions posted are good examples. Strange as it may sound, I recall a number of years ago when the Smothers Brothers were being interviewed before an event at which they were chosen to perform the National Anthem. When asked about the length of their performance, the response was "36 seconds". They explained further that the performance should be about honoring our nation and not the performer. Sung as it should be, that's how long the National Anthem will take.
In case you missed it, the following was the Anthem prior to the Super Bowl this year. I was totally choked up on this one.