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Hard to say. I had a couple buckets of live rock I let sit inside for a few days. House was around 78 though. And I also can't say for certain how much die off occurred in the process. It did keep me from having to cycle my son's 29g tank though.
I had 160# of live rock sitting in tubs with no heat or power heads. I finally got it in my 150 2 weeks ago and barely had a cycle. Stayed around 70 the whole time