Typically 30 - 60 minutes. Initially with 1-2 hiring managers, and then if successful with the hiring manager's direct leader. Come prepared to speak about specific situations you have encountered in your experience.
first a hr interview then you are asked logical and problem solving tests to determine your effectiveness as a leader. followed by a technical interview to give you a good chance too prove your mettel
Interview questions [1]
Question 1
how would you solve global warming in a cost effective manner given a position of influence