Hi
Just looking through for threads nobody has replied to.. 
There is no restriction on the length of your project as far as I know, but saving to DVD via the software has encountered problems with other users. Further, it is not (IMHO) fully implemented as you can't have customizable menus or more than one project per DVD.
I would suggest you save your project to your PC as an HD avi file, and then use a third party DVD creator to make your disk. This way you can have previews, menus and a choice of buttons which the VP version doesn't create.
If you have Windows Movie Maker then you will probably also have Windows DVD Maker which will do the job.
If not, try DVDStyler which is a free DVD creator program and which gives you full control over nearly all aspects of the creation process.
http://www.dvdstyler.org/en/downloads
Another free program is the SoThink DVD maker. This does a similar job but, if you haven't bought the software it places a green advertscreen between each film (or at every bookmark if you have used these). It's not particularly annoying though, otherwise it is free to use with no time restriction apparently and the results are good otherwise.
http://www.sothinkme...ovie-dvd-maker/
You can upload the avi to UTube with their uploader. I don't think there is a time limit to their uploads now but possibly other forum users can advise you about this.
Nat