When you add a still image, you can assign a specific duration to it, which specifies how much time the image occupies in the Timeline. You can set a default duration for all still images that you add, and you can change their duration in the Timeline.
The frame rate of your project determines the amount of time that a certain number of frames occupies. For example, for NTSC, if you are working in a 29.97 frame‑per‑second (fps) project and you enter 30 frames as the duration, each still image that you add to the Timeline has a duration of about one second. For PAL, if you are working in a 25 fps project and you enter 25 frames as the duration, each still image that you add to the Timeline has a duration of one second.
Change the default duration for still images
Set a unique duration for a still image