When delivering a slide show, you can move from slide to slide in the following ways:
Manually. You control when you move by clicking the mouse button, pressing keys, or clicking commands.
Automatically. PowerPoint displays each slide for a predefined length of time and then displays the next slide.
The length of time a slide appears on the screen is controlled by its slide timing. By default, slide timings are divided equally among the animations for each slide. So if a slide has a title and four bullet points that are all animated and you assign a timing of 1 minute to the slide, the five elements will appear at 12-second intervals.
To apply a timing to a single slide, to a group of slides, or to an entire presentation, ...