How long should I boil live rock for?

[Mechaninano]

So I purchased some live rock that had aiptasia on it. I put it in my brother's tank and the aiptasia exploded! Its every where (sorry Corey). So I have approximately 40 lbs of live rock covered with aiptasia that I have decided I'm going to boil to get rid of them. (I've got another 40 lbs of pest free live rock that I will use to seed the boiled rock for my tank start up). So my question is, how long should I leave my rocks in the boiling water? (I know about the hazards of boiling corals such as zoa's, the only thing on the rocks is aiptasia and a few zenias). Any input is greatly appreciated.

Thank-you.