My greens opened up right away, but my commons took 4 days. I was thinking, great - my 3rd coral and I've killed it.
Now they don't even close in moonlight. I think it was because where I placed it, my lighting was a lot brighter than where they were in LFS tank and they were just getting used to it. That and when I first put it in the tank, they started opening and my cleaner shrimp ran all over it to check it out. Don't think the coral was too happy about that.
Give 'em a couple days.