Hallo
Maybe I`m not the right person to answer nr.1, but I think there should be enough inside the book to keep you busy in the Stavanger area for at least a week!
As for your next question, Between Kristiansand - Stavanger, I would say in general that most bunkers are open. Some are of course bricked up, on private hands or with the military, but you could still spend 2 more weeks in that area without reaching over everything
Rgds
Erik E