I had 2 phone screens, which were quite pleasant. In both they asked a few general programming knowledge questions, then a "write some code". The code was simple, atoi() function and tree ordering. Each phone screen was very laid back, took about an hour. The physical interview was grueling. Not necessarily the questions, they were fairly standard programming questions, but the length of the interview. I was assigned to interview with 2 teams at once so I was there for 7.5 hours all totaled.