I think it's a 2 night thing -- one night to the Curator, second night to Prince. Depending on who's around - - we soak up the other bosses, and eventually we'll be able to do it all in 2 nights (with both raids).
And I think I agree with you Mason when I say we probably need a core team that clears Karazhan as well as a secondary group of 10 people going through as well, these being the people who still have to learn more of the early fights and such. I think we're getting close to having the numbers we need, if we could only have everyone's schedules somehow miraculously coincide.