Nothing should be on the screen longer than 8 seconds, and the whole loop shouldn't be longer than 2-3 minutes. If you can't read the info in 8 seconds.... you have to much info on the slide. You want to cover the "Who, What Where, Why and How" in as few words as possible.
Now another idea is to have a scrolling screen. Move the text from bottom to top with only a line to break one subject from the next. Motion is constant, which draws your eyes to it, and the info is being fed at a constant rate and always changing.