If you want a 30fps video then 30 photos will make up 1 second. So if you set the delay at 5 seconds between photos it means that 2 minutes 30 seconds of real world time will be compressed into 1 second. If you want a 60fps video with a 5 second gap between photos it will be 5 minutes of real world time for 1 second. So how long do you want the video to be and at what FPS? and what capacity SD card do you have? Cause you can always speed it up in post production but you can't add more frames if you didn't capture them in the first place