Four hours can be fitted onto a single DVD, but you need to lower the quality of the video considerably. Since I don't use Adobe, I'm not sure how it burns a video to DVD. But if it would burn the DVD if the file were less than 4.4 gigs, I say make your own MPG2 file. So instead of selecting to Burn to DVD, render your 4 hour video to MPG2 format. You will need to adjust your compression settings to turn what would be a 48 gig AVI2 video file to become a 4.4 gig MPG2 file.
But have you tried to burn less than the entire work of art to one DVD? Once again, I don't know the steps, but I know there is a simple way to use the NLE to select the first hour or so and then Burn to DVD just the selected region. Or to maintain as much quality as possible, you might need to render that selected hour of video to your hard drive, in any format you'd like. Then close that NLE project, load the hour of rendered video into your NLE and then Burn to DVD just that hour.
One last thing, are you sure your computer has enough free hard drive space to do what you are asking it to do? You could have run out of memory on your hard drive during the rendering process. If you still want to try to burn the entire four hours to one DVD, then clear a bunch of memory space so the NLE can render the video.
In closing, I'm guessing the real problem here is that you are limited in the amount of time you can render on one DVD. The easiest solution is to select only that portion on your EDL for the Burn to Disc function. Maybe someone familiar with Adobe can detail the actual steps to do it.
