That really depends on the casts and how they work together. Some of them can change flawlessly, and others take time.
Since I'm working there, I haven't personally gone through any of the Houses, so it's probably hit-or-miss on some of them if you'll get that gap or not.
... I know there's a Cast Schedule around here somewhere...
http://www.horrornightnightmares.com/forums/index.php?showtopic=900