long distance training

I am training for a 100 mile ride and i was wandering what the best training distance for it would be, because when you train for a 10 mile time trial you do intervals of 20 minutes. are long intervals good for it.
thanks
thanks
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Just put long steady miles in building up over a period of time, it's no big deal, if you're determined you'll manage it easily.
The above post may contain traces of sarcasm or/and bullsh*t.
This months Cycling Plus has a 12 week programme and good article in it for getting to the ton (Page 100 - 107).