You just need software that can recode the original movie to compress the filesize.
As a result, you may notice some difference in quality if you play the DVD on a super high definition TV or computer screen, but the length of movie you are talking about should do fine for most purposes.
The video quality noticeably degrades on a single disk DVD if you try to stretch out to 3 hours or more.
I use this program for quick and dirty DVD making and burning (basically you select a DVD menu template, drag in your movie file, and let the program figure out how much to compress), but there are numerous software programs that can do the compression of the movie and allow you to use a more sophisticated DVD making program.
http://www.vso-software.fr/products/convert_x_to_dvd/
Kym