In the Timing section, you can customize the timing of animation effects. The Duration box allows you to set the length of time for an animation to play. 

To set the length of an animation effect:

You can make an animation display either automatically when the question slide comes up or you can delay the animation for a few seconds.

To delay the start of an animation effect:

Note: Both the Delay and Duration values are set in seconds. The maximum value is 99.99 seconds.