Extensive but casual. I waited about 15 minutes before being led to a small room to re-take the skills assessment required upon applying (I think to ensure no cheating). From there I went to a small conference room and met with two account executives who played good cop / bad cop. One was kind and inviting, the other was cold and calculating. After 20 minutes or so they left and two lower-level sales staff entered for another round. They were clearly there to discern if I would be a good match for the company culture. Both were very kind and even invited me to get a beer if hired. One walked me out afterward.