That's why I suggested to try just a small section, to save time in the final render...

The reason for the re-render is because you have dona an MPEG with PCM sound and DVD is now trying to convert it to AC3 and so on.....

There is no AC3 option in the MPEG options, it has its own template.

You need to make your own render template using one all ready there, make sure the audio is not selected in there then render when that is done then render the same file using the AC3 template, so two renders here one for video one for audio, this is where the SCRIPTS come in handy as they will do them automatically for you

There is no point in doing a render in Vegas and then getting DVD-A to do it all again.

Normally a 2 hour video with AC3 takes DVD-A about 12 mins to make the Vob files and its ready to burn, that takes about 12mins again depending on the write speed,