About Transitions
Each slide has its own transition settings, accessible in the Transition tab in the Slide
Inspector. The default transition settings for the slideshow are in the Transition tab in the
Slideshow Inspector.
The transition is considered part of the slide, and, in most cases, does not affect its duration.
Using long transitions may lead to the slide being visible for only a short time, or may
require the slide’s duration to be increased. When you select a transition for a slide, group
of slides, or the slideshow, a warning appears if any slides must be lengthened.