Also, to directly address the (rightfully unhelpful) question: MEMPHIS only broke $1M 3 weeks, but in a much bigger house which would easily make it the weakest Best Musical winner in recent memory. Even after the Tonys that year, it only broke $1M for the first time over Columbus Day weekend that fall. The only other $1M weekends were the New Year's weekends of 2010 and 2011. Those two New Year's weekends were also the only weekends MEMPHIS ever surpassed 80% potential gross.
So, given that GENTLEMAN'S GUIDE has a smaller house and a more limited potential, and has been exceeding it's potential regularly since the Tony win, which MEMPHIS never did, it's reasonable to say that the honest answer to the original question is, "four years."
And then, "ho hum. That was easy to look up."
Words don't deserve that kind of malarkey. They're innocent, neutral, precise, standing for this, describing that, meaning the other, so if you look after them you can build bridges across incomprehension and chaos. But when they get their corners knocked off, they're no good anymore…I don't think writers are sacred, but words are. They deserve respect. If you get the right ones in the right order, you can nudge the world a little.