The turn-around for marquee additions/changes post-Tonys has been 1-2 days for the past few years. I even remember one show changing theirs on MONDAY MORNING, just hours after winning their awards.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle