Why is everyone making life so difficult for themselves…..
Simply edit 2 x 12 hour films with FCP and stitch them together using Visual Hub or a similar program with this facility. I often do this when I am creating 24 hour underwater film schedules for hotels with in house TV channels. And the comment about not being able to play this without a computer, wrong again….! Most good quality DVD players have USB ports. I normally make the 24 hour schedule an AVi file (Average size 19GB), put it on either an SD card or a flash drive. The DVD player will play it. It can also be played of an iPod if you make the file MP4…..
Hope that helps