very long, through many channels and layers... You talk to a lot of people, they screen every single aspect of your life. First you get a phone interview, next a second phone interview with different person. If you pass, you have an interview with this person, but this time at they offices, next stage you speak with the team of creative and than with the head of creative. If they select you, there's a big screening of your background, drug testing, checking with each employer and every single detail of your resume is checked. so don't lye in your interview at all.