Well I know for a fact that yes while LR is damp shipped it definitely needs to cycle, of course that could be due to macroscopic organism die off and less about microscopic. I'm not super concerned about this build session/party, because it's not like I'm going to use all my rock to build one megastructure, but in the future I wonder how much cycling I'll have to do... although now that I think of the tank will be new so all the surface area needs to be colonized, and if I use sand (still unsure if I will) that needs to be colonized.
That said, someone on another forum said there will be some die off, but shouldn't be critical levels unless the rock is complete dried. Which makes me wonder does that rock need to be complete dry for this stuff to attach two pieces?