The following is another training plan for 100K event which emphasizes time, instead of the distance.

http://ultrarunning.co.nz/content/100km-training-programme

On the other hand, I would like also to share the following training plan from Nancy Shura, the Race Director of the Bulldog 50K in Calabasas/Malibu, California for the 100-mile distance. I could still remember that Nancy is the ultra coach of my friend, Benjamin Gaetos.

http://www.trailrunevents.com/ul/schedule-100m.asp

Good luck and train well.