This is a powerpoint slide show that I use as a timer. Its length is 60minutes total, but you can set it to begin where you want be clicking on the slide and playing it from there. At 10 minutes, the timer is set in increments of one minute per slide. My kids love this. When time is almost up, the slides make a sound indicating that it is time to wind up the work. At the end of mine, it plays the Hawaii 50 theme song.