A few engineers from Intel came to my university to recruit graduating doctoral students. At the end they collected resumes and emailed some students the next day for phone interviews. The phone interview was around a half hour on a Friday, and the interviewer said he would speak with groups at Intel and see if anyone was interested. The following Monday I received an email inviting me to fly out for an interview a week and a half later.
The interview day started with a presentation of my thesis work and a technical interview with around 4 engineers. They took me to lunch and then a short tour of the fab, then the afternoon consisted of two interviews with a manager (one level up) and then an area manager (two levels up.)