I have a couple of a questions, since destroying a chamber is an extended action,
1.) How long is the time between rolls?
2.) Can any hero choose to start the process of destroying a chamber at anytime and what does that look like or entail?
3.) Why would a hero ever choose to cross dangerous or hazardous terrain to get to the horror if they can simply start destroying the chamber and either succeed or force the horror to come to you?

Even though due to dream logic chambers can be any size, a chamber that is a vast desert expanse or an endless forest should still...