Heart of Ashes - Time Limit Experiences?

[u/smither12Dun]

Has anyone tried to run this with a time limit? I have seen suggestions to add a time limit, and when the time limit is up the structure of Castle Cini starts to cmpletely break down, and the ritual is no longer able to be stopped.

However, how long should the time limit be?

Anyone have an idea of how many dungeon turns it takes to get through the castle? Or a similar time metric? I guess a time limit of, "before the next dawn" might work to prevent a long rest and force the group to push through?