It takes about 50 minutes to transcode 200MB PAL to NTSC on 850 Mhz CPU, thus it would take about 14-16 hours to transcode 3.7GB Wedding movie.
Plus, DVDIt author DVD in about 45 minutes.
On 1.6 Ghz CPU it takes about 15 minutes for 200 MB with crop and de-interlace, thus 3.7 GB could be done in about 5 hrs.