I was referred by a now-fellow-coworker, and the whole process took around a month from start to finish. It was by far the most humane interview process I have gone through-- my first interview was over coffee/lunch with the director of my team and I was asked back to meet with 4 or 5 different potential teammates and share a small skills test with them. The whole interview felt like a conversation-- I was able to ask many of my own questions-- and everyone was very friendly!