As far as the curing goes, it all depends on how uncured your rock is. I got some rock in my tank that was entirely uncured, and the smell was putrid. I'm still curing it now, but the smell isn't as bad anymore. It was about a week of rank stench. Kind of like low tide in a busy marina lol
Running carbon while curing helps a bit with the smell. But again, it really all depends on how uncured the rock is.
120G FW--All Male African Haps and Peacocks
75G SW--Eventual Reef Build (work in progress)