To adjust the speed or duration of your In/Out animation, drag the gray bars to enlarge or shorten the blue animation section in your timeline. This blue bar represents the time in which the animation takes place.
If the blue bar is shorter, the animation will play more quickly. If the blue bar is longer, the animation will play more slowly.
By default, the duration of an object's In/Out animation is 0.5 seconds but you can increase or decrease its speed or duration.