How do the pros export large files to DVD?

Hi, I am fairly new to Adobe PPro2 - up to now we have used it to edit analog footage in wmv format, with pretty poor quality results.

Now we have 2 DV cameras, and LOVE the speed at which we can edit/pre-render, and the quality - woo hoo!

My question is, how to export to DVD like the pros?

I am editing a 2-act live theater show, each act is one hour. I want to put both on one disc.

If I export an .avi file and use Nero to create the DVD, the .avi file on a one-hour program is 60Gbs, at the default 740x480 settings. So of course Nero kicks on it.

How do the pros put a high-quality 2-hour movie on one DVD?
I don't want to lose quality, but have no idea how to do this.
Trying to burn to DVD straight form PPro2 results in a file size too large error.

I saw on another forum that Encore was the product to use, but product reviews called in a consumer product, and not adequate for pro use.

Using a Dell XPS Gen 5 3.25Ghz desktop with 3 Gbs of RAM

Any assistance is highly appreciated.