Day-long interview...

I'm interested in how this went for you. I'm new to management and will be starting soon as manager, then moving into director role shortly after. I have director friends and just asked them about salary.

I can't imagine any interview process taking that long. I interviewed for 30 minutes for my current DON position.

In my experience, the bigger deal (higher "status," more responsibility, higher salary) the position is, the longer the interview. I've applied for several positions with an all-day interview process (meeting with different individuals and groups plus touring the facility), and the interview for my current position was two days (interviewing, touring, and shadowing an individual employed in a similar position in the department). My own observation in recent years has been that the organizations doing this are the ones who want to make sure they make the best decision possible the first time around, and don't want to hire someone who's not going to work out (for whatever reason) and then be reposting the position and starting over again in a few months. I've come to consider the "quicky"-interview facilities as being those that don't really care that much about who they hire (and that would be a bad sign ... )

Hospital soup has great questions for nursing management positions

My most recent interview was several phone calls and then several days long. Because of the distance they flew me into town and paid for my lodging.
It really depends upon the position you are being considered for, the agency itself, and the logistics of any geography involved.

Good luck