I've not had chance to test my 40 gig monster today. If anyone's curious, though, it is an odd one.
Did a three day job recording an entirely improvisational noise rock band. Came out of it with about 6 hours of 24 tracks at 44.1/24. I record to an old (but awesome) Fostex HDD recorder and then import into Sonar later when I'm doing band stuff.
So I'm initially working on a project containing the whole six hours, and planning to chop pieces out for later proper mixing and editing.
As you can likely imagine, it varies wildly across those six hours, so there's a fairly short limit on how long it's worth keeping a common base mix for all of it. But for now, that's what I've got to work with. And to blow some smoke up Sonar's ass, I was impressed with the extent to which it's just worked like it was a regular three minute song.