The whole ride excluding the first floo scene.
To me what the dementor room needs the most isn't lighting adjustments, it's that it needs to be COLD. It's supposed to get cold when one gets near you, let alone how many are in that room.
So...
Also, where are guests supposed to watch the show? The only areas that would provide a decent view of the castle would be in front of the Triwizard Spirit Rally stage and along the secondary Wizarding World entrance/exit that wraps around the backside of Ollivanders, Wiseacere's, and The Three Broomsticks. Even then, no matter where guests stand, this will make Hogsmeade even more congested than it already is.
This is so much easier for IOA since there's multiple locations, but I have a bad feeling that bleachers are going to be built in USH.
Bleachers take up more room than having people stand together. So that won't happen, especially not for a possible 6-7 minute show.
I meant in non-walkway areas.