>How long would it take a real app to go through a few hundred million objects?

Probably not in our lifetimes. :)

>I think it's safe to say too that a 7/24 app is going to create a set of static objects that have a lifetime equal to the app instead of lots of instantiations.

That would no doubt be best. I was thinking of an app where forms were created and destroyed, over and over, but that's certainly not the way it just be written. And if this did turn out to be a problem with 7/24s, we would've heard about it. :)