One method you can try is to create two playlists from the recording and transfer each to a separate disc. To do this, first you will need to add a chapter mark at the two hour mark. Then, create a new playlist containing only the first chapter of the title and dub this to DVD. Then create a second playlist containing only the second chapter and dub this to the second DVD. See pages 40 to 42 of the manual (going by the one I have at hand), as this gives steps to inserting chapters and how to create a playlist.

The alternative method is to do a normal speed dub from HDD to DVD. Use the 'Flexiable Rec' mode and this will re-encode the title to fit on the target DVD. Just be warned that this method will result in a slight loss in picture quality, however the original title on the HDD will retain its quality.