Thank you, Technical.
With a clean install of XP (no updates) and just a couple of programs added, VRDB on my computer takes just about 10 minutes to do its thing. With all the XP updates installed (and with the programs I add), it takes little over 30 minutes.
Sarge, I suspect it depends upon how many programs you've got on your hard drive -- the more, the longer.
Perhaps your operating system processing speed has something to do with it? Avast! Team should be able to provide you with a better answer.
Dave