Likely a similar length of time as Shrek's second theater.
Dunno. We don't a recent frame of reference for it.
But, a Sprung has a total space of approximately 5,200 square feet. La Bamba is a conservative 7,500 square feet. While, yes, using it would require clever design and the removal of stuff to work, that's not uncommon.
Again, though. This is a rumor. And while more houses have been brought up (as rumor) in the past, this is a first time a location has been tied to any of them.