The first interview was a phone screen with an HR peson consisting of your basic interview question, ie leadership style, accomplishments, goals, objectives. It also consisted of a detailed discussion of Mars unique . The 2nd interview was also a phone interview but with the hiring manager. It was about 1.5 hours and went deep into functional experience, accomplishments. I was immediately told that I would be invited to come in for a formal interview. In the interim, they had asked me to execute an online personality survey.
It took about a month to schedule the in-house interview. It consisted of 2 - 2 people panel including HR, the hiring manager, and 2 peers. I would say it was relatively easy overall. The individuals spent alot of time talking about the Mars culture and making sure I was a good fit.