How long should I boil live rock for?

[Myka]

I would not have done that if I were you. Chances are you killed off a good portion of the aerobic and anaerobic bacteria on the live rock. This will cause the rock to leech a lot of ammonia and phosphate.

Now that it is done, I wouldn't put that rock into any tank for a long time. I would put it in a tub and "cook" it (does not involve the stove!) for several weeks so it can leech those nasties somewhere safe before introducing it back into a tank where it can then be seeded.