If photos/videos for your selected timespan exceed the space available on one DVD, additional discs are added to your order. Each additional disc costs US $10.99 (including tax).
If all photos/videos fit on one disc, no additional discs will be added to your order. If you're creating a TV Version DVD and would like to limit your order to one disc, just set the "Fit on 1 DVD" option to ON. This will auto-select videos to include without exceeding the space available on one disc. For more information, please click: here. You can also manually select which photos/videos to include by tapping "Videos" or "Media" on the Order Review screen.