We've had threads on this board before about how to practice your timing of 10 second, 5 second and 3 second calls. I've got it figured out. I was watching an old game on cable and Billy Packer was doing the commentary. It occurred to me that he said something stupid every second. I recorded the game and played it back, practicing my one-second timing against his stupid comments. It worked out perfectly. I would highly recommend doing this.
Of course, after listening to him for a while, you'll need meds.