I got these errors:

notice: Undefined index: seconds in /Users/matt1/Drupal-devel/drupal-6.x-dev/sites/all/modules/duration/duration.inc on line 120.
notice: Undefined index: daysonly in /Users/matt1/Drupal-devel/drupal-6.x-dev/sites/all/modules/duration/duration.inc on line 124.
notice: Undefined index: minutes in /Users/matt1/Drupal-devel/drupal-6.x-dev/sites/all/modules/duration/duration.inc on line 120.

I'm using Views 6.x-3.0