A DVD holds 2 hours of videos on it yet if your Project in a Timeline is 2 hrs and 15 min then it will fit on a DVD-R as there are ways to change the compression you are able to work with to make it fit. Also you are able to take some videos that are completed and drop in on many of the applications and it will burn them in that time limit. Nero and Roxio are able to use Drag and Drop recording.
Yet by far the easiest way is get a Dual Layer DVD as almost all Laptops and even Towers have them they are standard. Not knowing which type of video editing program it would be hard to tell you how to export your project.