Apple Engineer interview questions

First I had a phone screen with several people on the team. I guess that went well, because they immediately invited me for an on-site interview. I then spent ~7 hours interviewing with 8-9 individuals. They asked me a bunch of technical questions and I had to draw a lot of things on a whiteboard. I received a verbal offer by the end of the week.

It was in a fancy hotel in Taipei. After registering on the info desk, we were made to wait for about 20 minutes, while 3 interviewers interviewed me in 3 different fancy hotel rooms, for a total of about more than 1 hour