working interviews and informational interviews?

So I have two questions:

1. Working interview: I had a traditional interview today for a interventional clinic RN position. I thought it went well and I was asked back for a 4 hour working interview next week. I've never done this type of interview and am not sure what to expect? Is it paid (i forgot to ask and didn't want to talk salary at that point)? any tips or advice?

2. Informational Interview: I also have a rather informal/informational interview later this week with the director of critical care at a local hospital. I did clinicals at this hospital and recently reached out despite their being no current new grad openings. She graciously agreed to meet with me to discuss their hiring process, put name to a face, etc. I am nervous as I would love to work here and have never done this kind of meeting/interview. Any advice on what to ask, talk about, etc to stand out and make the best use of the time?

Thanks!

I had a working interview a few years back when I was a Medical Assistant applying at an urgent care. It wasn't paid and basically they just saw if I got along with the staff ect... I was offered the job the next day.

I had one of these informal/informational interviews back a few months ago with a Nurse manager. I contacted the nurse manager myself and we set up the interview with out going through HR. It was much more laid back and I felt I was able to "sell" myself better this way. We hit it off great but unfortunately the job didn't work out for a few different reasons.

My suggestion is treat it like a regular interview and be prepare to answer clinical based questions if asked. Know all about the hospital and their Mission statement.

Best of luck