There are a few things that will help lower the time it takes.
1. Make sure that your DVD Write is on a seperate ide cable than your hd.
2. Try booting into safe mode and performing the operation and see if you notice any speed difference. But first, make sure that you defrag your hard drive. Defragging can make a huge difference in burn/encoding performance. I defrag mine at least twice a week if I'm doing much encoding, or I at least defrag right before I start working with video files. It does make a big difference.
Best scenario is to have two hd's. One for operating system and programs, and one for dvd/audio files only, and have your main dvd burner on the same ide cable as the operating system hd. Better yet is to use sata hd.