Timing your presentation
Some people like presentations that advance automatically, and others like to control the advance of slides with a tap of the screen. Whatever your preference, you can use the Rehearse Timings tool to practice the amount of time you want to allow for each slide in your presentation. When you get the timing the way you like it, if you want to automate the presentation, you can record your settings and save them as part of your presentation file. If you just want to use the tool to rehearse, you can opt not to save the timing data.
Time the presentation
On the ribbon, tap the Slide Show tab.
In the Set Up group, tap Rehearse Timings.
The presentation begins to play and the Recording toolbar appears in the upper-left corner of the screen.
Tap Next when you are ready to advance either to the next animation or, if there are no animations on your slide, to the next slide.
Tap Pause to pause recording. This control and others appear in the upper-left corner of the screen.
A pop-up message box appears indicating that the recording has been paused. When you’re ready to continue, tap Resume Recording.
Tap the Close button when you’re done recording timings.
PowerPoint displays a message box asking whether you want to keep the new slide timings. Tap Yes to save your new settings or No to cancel the timing values.