First, an admin comes in to tell you about their application form. You fill it out regardless of whether or not you get hired, so yes, it's a time consuming procedural thing that has no meaning (meaning, don't put down your social). They were very strict to have everything filled out.
It was an mostly a grilling interview with the main HR. If you pass the HR, you are welcomed to a group interview of your department and see if they like you (they get the final say on this).
I've spent 25 mins with the HR, and 5 minutes with the group.
I must say, this was the most STRICT interview I've ever had.
One special note I must mention. An interview question of theirs was to ask if I was punctual. Their whole company, from the moment I arrived, felt extremely formal and always wanted things to be "on time". Unfortunately, they themselves do not reflect punctuality. Be prepared for some long gaps of time waiting for the process to start.