Red flag - long interviewing process
That is pretty normal. That does not mean it is good, but it is not worse than your average university. Two things play a role here: 

First, universities are just large organizations with all the bureaucracy and inefficiency that comes with that. 

Second, universities are often self organizing, that is, the professors take a large part of the management duties. That is a good thing, in the sense that decisions are made by people who know what they are talking about. But it also means that a large part of those tasks are performed by people who are not primarily managers and have competing priorities (research, teaching).