How long does it take to burn a dvd


I wanted to burn a dvd of 2 files of a tv-series (XVID files) with Nero Vision Express 2. The process of transcoding lasted for 5 hours and some minutes. After that the burning process started. After about 8 hours it seemed that the whole process had stopped. The process bar didn’t show any activity any longer. The only things that moved was the clock.
How long does it take to burn a dvd? I saved the project as a nvc file. Can I use it again or do I have to start all over again?